Did you mean "atp"? if so It is less I hope this helps please mark brainliest :)
Answer:
6.
Explanation:
G, H, O, N, Na, P
There are 6 different elements listed, with O (oxygen) showing up twice.
Isotones are nuclides that have the same neutron number but a different proton number. Therefore the answer is C. boron and carbon.
