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Explanation:

How many neutrons are there in the nucleus of arsenic?42 neutrons

The nucleus consists of 33 protons (red) and 42 neutrons (blue).

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Elemental Arsenic has 33 neutrons, since the number of protons and neutrons for all elements (in their neutral states), are equivalent.

An element has isotopes, which means the same number of protons but different numbers of neutrons.

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