Which among `Na,K,Pb` and `Li` has the lowest melting point?

Explanation

To determine which element among Sodium (Na), Potassium (K), Lead (Pb), and Lithium (Li) has the lowest melting point, we can follow these steps:

### Step 1: Understand the Elements
- Identify the elements in the question: Sodium (Na), Potassium (K), Lead (Pb), and Lithium (Li).
- Note that Sodium, Potassium, and Lithium are alkali metals, while Lead is a post-transition metal.

### Step 2: Review the Properties of Alkali Metals
- Alkali metals (Li, Na, K) are known to have relatively low melting points compared to other metals.
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