Chapter SH, Problem 20.5APP

To determine

To find: The nucleus produced.

Answer to Problem 20.5APP

The nucleus produced is $\text{R}\text{n}$ .

Explanation of Solution

Given:

  $\text{R}\text{a}$ decays to by emitting an alpha particle.

An alpha particle is same as the helium nucleus $\text{H}\text{e}$

Calculation:

A reaction can be written as:

  $\begin{array}{l}\text{R}\text{a}\to \text{X}+\text{H}\text{e}\\ \text{R}\text{a}\to \text{X}+\text{H}\text{e}\end{array}$

An element with the mass and atomic number of X is Rn.

Conclusion:

The nucleus produced is $\text{R}\text{n}$ .