Answer:
The answer is C.
Explanation:
Mass is converted to the energy binding a nucleus together.
Answer:
3,4
Explanation:
Hydrogen has no other electron hence there is no screening of the valence electron by inner electrons. It is the lightest known element with a relative molecular mass of 2. Screening effect refers to the fact that inner or core electrons prevent the outermost electron from feeling the attractive force of the nucleus.
None of the above?
(Is there any statements?)
