Which among `Li,Na,K` and `Cs` has density greater than water?

Explanation

To determine which among lithium (Li), sodium (Na), potassium (K), and cesium (Cs) has a density greater than water, we can follow these steps:

### Step 1: Understand the densities of the alkali metals
- Alkali metals are known to have low densities due to their large atomic sizes. The trend in density among these metals generally increases as we move down the group in the periodic table.

### Step 2: List the densities of the given alkali metals
- The densities of the alkali metals in question are as follows:
- Lithium (Li): 0.98 g/cm³
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