In Mn-55, how many neutrons are present?

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Multiple Choice

In Mn-55, how many neutrons are present?

Explanation:
In Mn-55, the mass number (A) is 55 and the atomic number (Z), which equals the number of protons, is 25 for manganese. The neutrons are found from N = A − Z, so N = 55 − 25 = 30. Thus, there are 30 neutrons.

In Mn-55, the mass number (A) is 55 and the atomic number (Z), which equals the number of protons, is 25 for manganese. The neutrons are found from N = A − Z, so N = 55 − 25 = 30. Thus, there are 30 neutrons.

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