a) 11 protons, 13 neutrons
b) 11 protons, 13 neutrons, 13 electrons
c) 13 protons, 11 neutrons
d) 13 protons, 11 electrons
Answer: a
Explanation: Z = 11, A = 24. Hence protons = 11 the neutrons
(24 – 11) = 13.
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