Question

The mass of the atom is bcoz of the mass of the.....?? ​

Answer 1

Answer:

We can get a rough value of an atom's mass in atomic mass units by working out the sum of the number of protons and the number of neutrons in the nucleus, which is called the mass number. The atomic mass of an atom is usually within 0.1 u of the mass number.

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Answer 2

Answer:

proton and neutrons..............

Explanation:

because there os negligible mass in electron