Per NCERT eqn 2.3 + 2.4, for a neutral atom what relations hold between atomic number Z, mass number A, and counts of protons / neutrons / electrons?
AZ = A − neutrons only
BA = electrons + neutrons
CZ = protons = electrons; A = protons + neutrons; neutrons = A − Z
DZ = neutrons only
Answer & Solution
Correct answer: C. Z = protons = electrons; A = protons + neutrons; neutrons = A − Z
Per NCERT §2.2.3, for a neutral atom Z = #p = #e and A = #p + #n, hence #n = A − Z.
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