1 Answer

Svyatoslav · Answer 1 · 2019-07-01T04:32:53+0000

Answer:

n = A – Z

Explanation:

The general symbol for an atom of an element X is
$_(Z)^(A)\text{X}$ , where

Z = the atomic number = the number of protons (p) and

A = the mass number = the number of protons + the number of neutrons (n)

A = p + n

Subtract Z from A. Then,

A - Z = p + n – p = n

or

n = A - Z

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