(a(i))[2]
State which letter, A, X or Z, represents the chemical symbol, the nucleon number, and the proton number.
(a(ii).1)[1]
Determine how many electrons are in a neutral atom of americium-241.
(a(ii).2)[1]
Determine how many neutrons are in a nucleus of americium-241.
(b)[2]
Explain the meaning of isotopes of an element.