Which notations represent atoms that have the same number of protons but a different number of neutr
Which notations represent atoms that have the same number of protons but a different number of neutrons?
(1) H-3 and He-3
(2) S-32 and S-32
(3) Cl-35 and Cl-37
(4) Ga-70 and Ge-73
Answer and Explanation: Choice 3 is the correct answer choice
Atoms of the same element that have the same number of protons but a different number of neutrons are called isotopes. Whenever we see an element symbol followed by a dash and a number, that number represents the mass of the element. Choice 1 is incorrect since H and He are different elements and therefore have different numbers of protons. Choice 2 is incorrect since these are two identical atoms with the same number of protons and neutrons. Choice 4 is incorrect since Ga and Ge are different elements. Choice 3 is correct since both are atoms of Cl and therefore have the same number of protons. Yet, their masses are different and thus the number of neutrons differ as well.
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