Facebook has a help article explaining a bit about account deletion and deactivation. Basically, deactivating your account in the settings only hides your account from public view - your account is still there and you can login whenever you want. Finding the page to delete your account is difficult - the url you need is: https://www.facebook.com/help/delete_account Even then, I think they only actually delete your account after you don't login for a certain period of time after submitting the delete request.

All the best! :)