Question

The total number of protons and neutrons present in nucleus

1) atomic number 2) mass number

3) isotopes 4) valency​

Answer 1

Answer:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

Explanation:

Mass number is the correct answer

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Answer 2

Mass number

is correct answer