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When an atom of Ba-137 undergoes gamma decay, the products are a gamma ray and a ___________ atom with a mass number of 137 and an atomic number of 56.

Answer :

Final answer:

When an atom of Ba-137 undergoes gamma decay, the products are a gamma ray and Barium-137 (Ba-137) atom with a mass number of 137 and an atomic number of 56.

Explanation:

When an atom of Ba-137 undergoes gamma decay, the products are a gamma ray and an atom of Ba-137. Gamma decay doesn't change the atomic structure of the nucleus, it merely reduces its energy state. It occurs when a nucleus in an excited state moves to a lower energy state by emitting a gamma ray.

Since the atom before and after gamma decay is the same, it retains its atomic and mass numbers. Therefore, gamma decay produces a Ba-137 atom with a mass number of 137 and atomic number of 56.

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