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PFChangs
The mass number is the sum of protons and neutrons in the nucleus. The atomic number is the number of protons. Therefore, you can subtract the atomic number from the mass number to find the number of neutrons. For example, Carbon's atomic number/number of protons is 6 and the mass number is 12.011.

Chemistry? I’m only in 8th grade science
ysabayomi

Answer:

Explanation:

Neutrons are found in the nucleus of an atom and they have no charge. To determine the number of neutrons in an atom, consider the formula below

Number of neutrons = Atomic mass - Atomic number

Atomic number is the number of protons present in an atom

For example, the number of neutrons present in sodium (Na) is

Atomic mass of sodium is 23

Atomic number of sodium is 11

Hence,

Number of neutrons = 23 - 11

Number of neutrons = 12

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