Which alkali metal and alkaline earth metal are radioactive? Give their atomic numbers also.

Explanation

To answer the question about which alkali metal and alkaline earth metal are radioactive, we can follow these steps:

### Step 1: Identify the Alkali Metals
The alkali metals are a group of elements in Group 1 of the periodic table. They include:
- Lithium (Li)
- Sodium (Na)
- Potassium (K)
- Rubidium (Rb)
...