What is NaO2H?

Answer 1

The cation is Na+.

Answer 2

Your compound NaO5 may look like an oxide of sodium, but it cannot, in fact, be created. Normal sodium oxide is NaO2, and sodium peroxide is Na2O2, and sodium superoxide is NaO2. These are all chemicals available to the investigator, and they are increasingly reactive and chemically unstable as the ratio of oxygen to sodium increases. No other oxides of sodium will "stay together" in chemical combination. Wikipedia has more information on the oxides of sodium, and a link is provided to their post on sodium oxide. The other oxides can be linked to from that post. You'll find that promised link is below this answer.

Answer 3

Na is Sodium

02 is 2 oxygen atoms

H is hydrogen

Answer 4

Sodium Superoxide

Answer 5

sodium iodite