2.An atom of the isotope chlorine-37 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)
(A) 17 p, 18 n, 17 e
(B) 17 p, 20 n, 17 e
(C) 17 p, 20 n, 7 e
(D)17 p, 37 n, 17 e
(E) 20 p, 17 n, 20 e

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