How many protons, electrons and neutrons are there in the following nuclei?
i. \(_8^{17}O\)
ii. \(_{12}^{25}Mg\)
iii. \(_{35}^{80}Br\)
Call
i. \(_8^{17}O\)
Atomic number, Z = 8,
Mass number, A = 17
Number of protons = Number of electrons = Z = 8
Number of neutrons (N) = A – Z = 17 – 8 = 9
Number of protons = 8,
Number of electrons = 8,
Number of neutrons = 9
ii. \(_{12}^{25}Mg\)
Atomic number, Z = 12,
Mass number, A = 25
Number of protons = Number of electrons = Z = 12
Number of neutrons (N) = A – Z = 25 – 12 = 13
Number of protons = 12,
Number of electrons = 12,
Number of neutrons = 13
iii. \(_{35}^{80}Br\)
Atomic number, Z = 35,
Mass number, A = 80
Number of protons = Number of electrons = Z = 35
Number of neutrons (N) = A – Z = 80 – 35 = 45
Number of protons = 35,
Number of electrons = 35,
Number of neutrons = 45