Arrange the alkali metals in increasing order of their density.

Explanation

To arrange the alkali metals in increasing order of their density, we need to consider the densities of each alkali metal in Group 1 of the periodic table. The alkali metals include Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Cesium (Cs).

### Step-by-Step Solution:

1. **Identify the Alkali Metals**:
The alkali metals are Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), and Cesium (Cs).

2. **Understand Density Trends**:
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