On the bottom of the page, you can tick the checkbox to delete your Google data permanently. Click on Delete Account and say goodbye to Google. So, this is how you can do away with your Google ...

Remove a Google Account from your device To remove an account from your device without deleting it, follow the instructions below. If you don’t see your device, visit the maker’s support site.

10. Open the email from Google you should have received with your alternate email. 11. Follow the deletion link in the message. 12. If prompted, log into the Gmail account you want to delete.