Chapter SH, Problem 20.2APP

To determine

To calculate: Number of neutrons in the given nucleus.

Answer to Problem 20.2APP

Number of neutrons is 30.

Explanation of Solution

Given:

The following nucleus:

  $\text{F}\text{e}$

Formula used:

The relation is,

  $\text{Mass number = number of protons + number of neutrons}$

Calculation:

According to the given nucleus,

Mass number = $56$

Atomic number = $26$

Since number of protons is equal to atomic number, number of protons is $26$ .

Number of neutrons is calculated as:

  $\begin{array}{l}\text{Mass number = number of protons + number of neutrons}\\ \text{56 = 26 + number of neutrons}\\ \text{number of neutrons = 56}-26=30\end{array}$

Conclusion:

Number of neutrons is 30.