How many electrons can be held in the second orbital (closest to the nucleus)

A valence electron structure would be like this 1s^2 2s^2 2p^6 etc 
1s^2 would be 2, 2s^2 would be 4, 2p^6 would be 12 and so on and so forth.

The orbital is called an energy level and they follow an 2/8/8 rule.
2 in the first
8 in the second
and
8 in the third.
so 8 would be the answer.

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .

The answer is a) carbon-12