1. The problem statement, all variables and given/known data Explain, in two or three sentences, why the O7+ ion can be considered to be a hydrogen-like ion. State what subatomic particles it is composed of and how many there are of each 2. Relevant equations 3. The attempt at a solution I know the correct answer to this, I just don't understand why it's correct. O7+ only has one bound electron. Why then is it called an O7+ion? should it not be an O1+ion as the other 7 electrons have been released?