Question

how to find atomic number by atomic mass?

Answer 1

By subtracting the number of neutrons from the atomic number , we get the atomic number.

Atomic mass is the sum of atomic number and number of neutrons.

Atomic number = number of protons = number of electrons.

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Answer 2

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Atomic mass

Atomic mass in an atom or group of an atom is the sum of the masses of protons, neutrons and electrons.

Atomic Mass = No. of protons + No. of neutrons