Question

Assertion: Atomic mass number is the number of protons present in the nucleus of an atom

Reason: All Atoms of an atom have the same atomic number​

Answer 1

Answer:

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Explanation:

The atomic number of an atom is the number of protons it contains. ... For example, all oxygen atoms have 8 protons and all sodium atoms have 11 protons. The mass number of an atom is the total number of protons and neutrons it contains. The mass number of an atom is never smaller than the atomic number.