Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Physics Nuclear Physics

When the masses of an electron, proton, and neutron are m_e, m_p, and m_n, respectively, then the nuclear mass of an atom _ZX^A is _____.

1

Zm_n + Nm_e

2

Nm_p + Zm_e

3

Zm_p + Nm_n

4

Zm_p + Nm_n + Zm_e

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