An atom of antimony has a mass number of 122. The atomic number of antimony is 51. Calculate the number of protons and neutrons in this atom – work must be shown to earn credit.

The number of protons and neutrons of antimony is 51 and 71 respectively.

Explanation:

We have for antimony:

A: mass number = 122

Z: atomic number = 51

The atomic number is equal to the number of protons, hence the antimony has 51 protons.

The mass number is:

Where:

N: is the number of neutrons

Then, the number of neutrons is:

Therefore, the number of protons and neutrons of antimony is 51 and 71 respectively.

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