Turnkeyconsulting.com - SEO Checker

Overview of the SEO Check
Meta information
99% 
Page quality
63% 
Page structure
58% 
Link structure
25% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.33 s
File size
112.00 kB
Words
1315
Media files
22
Number of links
144 internal / 13 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Risk, Identity & Security Specialists - Turnkey Consulting
The length of the page title is perfect. (508 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
Turnkey provides business consulting, technology implementation and managed services to help businesses safeguard their application environments.
The length of the meta description is perfect. (927 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://www.turnkeyconsulting.com/
There is a valid canonical link specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Language defined in HTTP-Equiv meta tag: en
Server location: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain name is very long.
The domain is no subdomain.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
descriptionTurnkey provides business consulting, technology implementation and managed services to help businesses safeguard their application environments.
viewportwidth=device-width, initial-scale=1
google-site-verificationb75eSNrqoWdAR-8BfTIDQGoXW7L-W1EMHlFiZrMqwN4
generatorHubSpot
langen
twitter:descriptionTurnkey provides business consulting, technology implementation and managed services to help businesses safeguard their application environments.
twitter:titleRisk, Identity & Security Specialists - Turnkey Consulting
twitter:cardsummary
og:descriptionTurnkey provides business consulting, technology implementation and managed services to help businesses safeguard their application environments.
og:titleRisk, Identity & Security Specialists - Turnkey Consulting
og:urlhttps://www.turnkeyconsulting.com
content-languageen
charsetutf-8

Test up to 1.000 webpages of turnkeyconsulting.com with our free plan!

Try For Free
No trial. It's just free!

Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
There are 8 text duplicates on this page:
  • Duplicate 1: Through the application of technology and automation, we'll help you m...
  • Duplicate 2: We'll help you ensure everybody within your organisation has access to...
  • Duplicate 3: Our experts will uncover security weaknesses within your security desi...
  • Duplicate 4: We have operations in all corners of the globe, so see which office is...
This page contains 1315 words. That's ok.
36% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
The page contains a listing, which indicates a good text layout.
20 paragraphs were found on this page.
No placeholders texts or images were found.
The average number of words per sentence of 18.79 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 26 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Page structure

H1 heading
(Critically important)
Making the world a safer place to do business
The H1 heading is perfect.
Headings
(Important)
Some headings occur twice on the page.
There are 79 headings on the page. The amount of headings should be in a more proper relation to the amount of text.
Some headings do not have any content.

Heading structure

Heading levelContent
H1 Making the world a safer place to do business
H2 Safeguard your business with our risk, identity and security expertise
H2 Your trusted partner for today and tomorrow's toughest challenges
H2 Who we’ve helped
H2 Latest news and views
H2 Trusted to deliver risk and security solutions worldwide
H2 Events
H2 Get in touch with Turnkey today
H3 RISE Right: How to Avoid FUEing Up Your S/4 Licensing
H3 Enterprise Identity - Tailored for Complex SAP Estates
H3 The End of SAP IdM: What to Know and Where to Go Next
H3 Preparing For the Australian Data Privacy Act Overhaul
H3 Safeguarding SAP in an Era of Cyber Legislation
H3 SAP for Internal Controls, Compliance and Risk Management Conference
H3 SAPinsider Las Vegas 2025
H3 Sign up to get the latest updates
H3 Empty heading
H4 A smooth implementation of SAP Business Integrity Screening (BIS) for controls automation for SAP S/4 HANA
H4 Turnkey implements SAP GRC to achieve significant business benefits
H4 Providing SAP Cyber Security peace of mind
H4 Managing access violation and improving efficiency with the Bedrock GRC Managed Service
H4 Implementing an integrated risk management platform using SAP GRC Process Controls
H5 Integrated Risk Management
H5 Identity and Access Management
H5 Cyber & Application Security
H5 Bedrock Managed Service
H5 About us
H5 Partners
H5 Corporate Social ResponsibilityCSR
H5 Get in touch
H5 Careers
H5 Webinars & eBooks
H5 Blogs
H5 Press Coverage
H5 Key events
H5 Case Studies
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 The End of SAP IdM: What to Know and Where to Go Next Duplicate text
H6 RISE Right: How to Avoid FUEing Up Your S/4 Licensing Duplicate text
H6 Our Solution
H6 Integrated Risk Management Duplicate text
H6 Identity and Access Management Duplicate text
H6 Cyber & Application Security Duplicate text
H6 ABOUT US
H6 Our customers
H6 Live Webinar / NOV 13, 2024
H6 ON-DEMAND WEBINAR
H6 ON-DEMAND WEBINAR / OCT 1, 2024
H6 ON-DEMAND WEBINAR Duplicate text
H6 Guide
H6 Customer success stories
H6 11-12 March, 2025
H6 Budapest, Hungary
H6 17-20 March, 2025
H6 Las Vegas, USA
H6 Services
H6 Resources
H6 Find Us
H6 Contact
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
34 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are 13 external links on this page.
LinkAttributesAnchor text
/Subdomain IMG-ALT Turnkey_Logo_RGB_trans_white-
/servicesSubdomain Services
/integrated-risk-management-se...Subdomain Integrated Risk Management
/identity-access-managementSubdomain Identity and Access Management
/cyber-application-securitySubdomain Cyber & Application Security
/bedrock-managed-serviceSubdomain Bedrock Managed Service
/servicesSubdomain All Services
/en/customer-successSubdomain Our Work
/about-usSubdomain About Turnkey
/about-usSubdomain Who we areABOUT US
/contact-usSubdomain Get in touch
/en/careersSubdomain Careers
/en/key-resourcesSubdomain Key insights
/en/key-resourcesSubdomain Webinars & eBooks
/keyviewSubdomain Blogs
/en/latest-newsSubdomain Press Coverage
/en/eventsSubdomain Key Events
/en/customer-successSubdomain Case Studies
/Subdomain English
/de/Subdomain Deutsch
/en-au/Subdomain English - Australia
/en-my/Subdomain English - Malaysia
/en-sg/Subdomain English - Singapore
/en-us/Subdomain English - United States
/fr/Subdomain Français
/integrated-risk-management-se...Subdomain No Text
/integrated-risk-management-se...Subdomain Text duplicate Integrated Risk Management
/integrated-risk-management-se...Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/identity-access-managementSubdomain No Text
/identity-access-managementSubdomain Text duplicate Identity and Access Management
/identity-access-managementSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/cyber-application-securitySubdomain No Text
/cyber-application-securitySubdomain Text duplicate Cyber & Application Security
/cyber-application-securitySubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/bedrock-managed-serviceSubdomain No Text
/bedrock-managed-serviceSubdomain Text duplicate Bedrock Managed Service
/bedrock-managed-serviceSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/about-usSubdomain No Text
/about-usSubdomain About us
/about-usSubdomain No Text
/partnersSubdomain No Text
/partnersSubdomain Partners
/partnersSubdomain No Text
/corporate-social-responsibilitySubdomain No Text
/corporate-social-responsibilitySubdomain Corporate Social ResponsibilityCSR
/corporate-social-responsibilitySubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/contact-usSubdomain No Text
/contact-usSubdomain Text duplicate Get in touch
/contact-usSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/careersSubdomain No Text
/careersSubdomain Text duplicate Careers
/careersSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/key-resourcesSubdomain No Text
/key-resourcesSubdomain Text duplicate Webinars & eBooks
/key-resourcesSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/keyviewSubdomain No Text
/keyviewSubdomain Text duplicate Blogs
/keyviewSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/latest-newsSubdomain No Text
/latest-newsSubdomain Text duplicate Press Coverage
/latest-newsSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/eventsSubdomain No Text
/eventsSubdomain Key events
/eventsSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/customer-successSubdomain No Text
/customer-successSubdomain Text duplicate Case Studies
/customer-successSubdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain No Text
/webinars/sap-iga-sailpointNew window Nofollow Subdomain Text duplicate The End of SAP IdM: What to Know and Where to Go Next
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain No Text
/webinars/rise-right-s4-licensingNew window Nofollow Subdomain Text duplicate RISE Right: How to Avoid FUEing Up Your S/4 Licensing
/contact-usSubdomain Text duplicate Get in touch
/about-usSubdomain Discover turnkey
/integrated-risk-management-se...Subdomain No Text
/identity-access-managementSubdomain No Text
/cyber-application-securitySubdomain No Text
/about-usSubdomain Meet the team
/webinars/rise-right-s4-licensingNew window Subdomain Live Webinar / NOV 13, 2024 RISE Right: How to Avoid FUEing Up Your S/4 Licensing
https://www.saug.com.au/WhatsO...External Subdomain ON-DEMAND WEBINAR Enterprise Identity - Tailored for Complex SAP Estates
/webinars/sap-iga-sailpointSubdomain ON-DEMAND WEBINAR / OCT 1, 2024 The End of SAP IdM: What to Know and Where to Go Next
/webinars/preparing-for-the-au...Subdomain ON-DEMAND WEBINAR Preparing For the Australian Data Privacy Act Overhaul
/safeguarding-sap-in-an-era-of...Subdomain Guide Safeguarding SAP in an Era of Cyber Legislation
/en/key-resourcesSubdomain See our latest thinking
https://f.hubspotusercontent30...New window External Subdomain Read case study
https://cdn2.hubspot.net/hubfs...New window External Subdomain Text duplicate Read case study
/hubfs/Content/Case_Studies/Pr...New window Subdomain Text duplicate Read case study
https://cdn2.hubspot.net/hubfs...New window External Subdomain Text duplicate Read case study
https://cdn2.hubspot.net/hubfs...New window External Subdomain Text duplicate Read case study
https://tac-insights.com/event...New window External 11-12 March, 2025 Budapest, Hungary SAP for Internal Controls, Compliance and Risk Management Conference
https://sapinsidervegas.vfairs...New window External Subdomain 17-20 March, 2025 Las Vegas, USA SAPinsider Las Vegas 2025
/eventsSubdomain View latest events
/contact-usSubdomain GET IN TOUCH
/en/careersSubdomain Text duplicate Careers
/en/careersSubdomain No Text
/about-usSubdomain Text duplicate About Turnkey
/about-usSubdomain No Text
/en/key-resourcesSubdomain KEY RESOURCES
/en/key-resourcesSubdomain No Text
https://twitter.com/turnkeysapgrcNew window External No Text
https://www.linkedin.com/compa...New window External Subdomain No Text
/integrated-risk-management-se...Subdomain Text duplicate Integrated Risk Management
/identity-access-managementSubdomain Text duplicate Identity and Access Management
/cyber-application-securitySubdomain Text duplicate Cyber & Application Security
/en/key-resourcesSubdomain Text duplicate Webinars & eBooks
/keyviewSubdomain Text duplicate Blogs
/en/latest-newsSubdomain Press coverage
/en/eventsSubdomain Events
/en/customer-successSubdomain Text duplicate Case Studies
/contact-usSubdomain See global office locations
https://registry.blockmarktech...New window External Subdomain IMG-ALT ias-cyber
https://www-turnkeyconsulting-...External Subdomain Privacy Policy
https://www-turnkeyconsulting-...External Subdomain Accessibility
https://www-turnkeyconsulting-...External Subdomain Contact us

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.turnkeyconsulting.com/"
HTTP header
(Important)
No X-Powered HTTP header is sent.
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time is excellent with 0.33 seconds.
The file size of the HTML document is fine (112 kB).

HTTP Response Header

NameValue
dateTue, 18 Feb 2025 22:49:38 GMT
content-typetext/html; charset=UTF-8
cache-controlno-store, no-cache, must-revalidate
last-modifiedMon, 17 Feb 2025 20:32:50 GMT
link</hs/hsstatic/content-cwv-embed/static-1.1293/embed.js>; rel=preload; as=script,</hs/hsstatic/keyboard-accessible-menu-flyouts/static-1.17/bundles/project.js>; rel=preload; as=script,</hs/hsstatic/cos-i18n/static-1.53/bundles/project.js>; rel=preload; as=script,</_hcms/forms/v2.js>; rel=preload; as=script
strict-transport-securitymax-age=31536000
content-security-policy"frame-ancestors 'self';"; upgrade-insecure-requests
edge-cache-tagCT-115168246678,CT-127095471994,CT-153971270802,CT-35046074613,CT-58475133562,CT-58482678713,CT-71967568243,P-1953781,L-57422263390,L-57422379624,W-69620600410,CW-181801241114,CW-56038405671,CW-56038553719,CW-56135668520,CW-56139137151,CW-56147208106,CW-56222021705,CW-56228624567,CW-56442506926,CW-69611079079,E-56034240573,E-56037345908,E-56037368692,E-56037427540,E-56037480196,E-56210829839,E-56210944146,MENU-69620600410,PGS-ALL,SW-3,GC-57422457441,GC-57422477615,TS-56037437223
referrer-policyno-referrer-when-downgrade
x-frame-optionssameorigin
x-hs-cache-configBrowserCache-5s-EdgeCache-180s
x-hs-cache-controls-maxage=10800, max-age=0
x-hs-cf-cache-statusHIT
x-hs-content-id35046074613
x-hs-hub-id1953781
x-hs-prerenderedMon, 17 Feb 2025 20:32:50 GMT
set-cookie270 Characters
report-to{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=RopzRfIzRjcMUvW0nV%2B4YIRafC3DHwmjjapJYjIEtu7drRXFitsQa2DkqSprUtwlpGtcKu80b7LK2IaFQO0zMt5q7XKh4TPa%2BSgLqWQs3wXxqY1F8fpN8Sdp0GtxtEKuMndQKkljRgzzcWc%3D"}],"group":"cf-nel","max_age":604800}
nel{"success_fraction":0.01,"report_to":"cf-nel","max_age":604800}
varyAccept-Encoding
servercloudflare
cf-ray9141924c7bc5d108-CDG
content-encodinggzip
alt-svch3=":443"; ma=86400
statuscode200
http_versionHTTP/2

External factors

This website has excellent links from other websites.
This page has backlinks from 122 referring domains.
This page has 329 backlinks.
This page has backlinks from 117 different ip addresses.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

User-agent: *

Disallow: /_hcms/preview/
Disallow: /hs/manage-preferences/
Disallow: /_hcms/
Disallow: /keyview/topic/
Disallow: /keyview/author/ 

Sitemap: https://www.turnkeyconsulting.com/sitemap.xml
Disallow: /hs/preferences-center/
Disallow: /*?*hs_preview=*
Disallow: /*?*hsCacheBuster=*

Search preview

www.turnkeyconsulting.com
Risk, Identity & Security Specialists - Turnkey Consulting
Turnkey provides business consulting, technology implementation and managed services to help businesses safeguard their application environments.

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
Turnkey85%Check
Turnkey Consulting80%Check
business66%Check
Consulting66%Check
Key Events63%Check
Business Consulting62%Check
Risk54%Check
Security54%Check
Identity54%Check
Managed54%Check

Test up to 1.000 webpages of turnkeyconsulting.com with our free plan!

Try For Free
No trial. It's just free!

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions