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Answer:
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.
Explanation:
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If men would steadily observe realities only, and not allow themselves to be deluded, life, to compare it with such things as we know, would be like a fairy tale and the Arabian Nights' Entertainments. If we respected only what is inevitable and has a right to be, music and poetry would resound along the streets.