Question

An atom contains 7 protons, 8 neutrons and 7 electrons. What will its atomic mass?

Answer 1

$\tt \quad Atomic \: Mass \\ = \sf no. \: of \: protons + no. \: of \: neutrons \\ = 7 + 8 \\ = \bf15$

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Answer 2

$\huge\underline\mathtt\red{Answer:-}$

=no.of protons+no.of neutrons

=7+8

=15