Answer
(a) 5 protons, 5 neutrons, 5 electrons
(b) 7 protons, 6 neutrons, 6 electrons
(c) 8 protons, 9 neutrons, 5 electrons
Work Step by Step
(a) $^{10}B$
A boron atom has 5 protons and since there are 10 nucleons, the atom must have 5 neutrons. Since the atom is neutral, the atom must have 5 electrons.
(b) $^{13}N+$
A nitrogen ion has 7 protons and since there are 13 nucleons, the ion must have 6 neutrons. Since the ion has a charge of +1, the ion must have 6 electrons.
(c) $^{17}O+++$
An oxygen ion has 8 protons and since there are 17 nucleons, the ion must have 9 neutrons. Since the ion has a charge of +3, the ion must have 5 electrons.
