Answer:
A. Proton = 6
Neutron = 7
Electron = 6
B. Proton = 56
Neutron = 74
Electron = 56
C. Proton = 92
Neutron = 140
Electron = 92
Explanation:
A. Mass number = 13
Atomic number = 6
Proton = Atomic number = 6
Since the element has no charge,
Electron = proton = 6
Mass number = proton + Neutron
Neutron = Mass number — proton
Neutron = 13 — 6 = 7
B. Mass number = 130
Atomic number = 56
Proton = Atomic number = 56
Since the element has no charge,
Electron = proton = 56
Mass number = proton + Neutron
Neutron = Mass number — proton
Neutron = 130 — 56 = 74
C. Mass number = 232
Atomic number = 92
Proton = Atomic number = 92
Since the element has no charge,
Electron = proton = 92
Mass number = proton + Neutron
Neutron = Mass number — proton
Neutron = 232 — 92= 140
