Write one difference between lithium and other members of alkali metals.

Explanation

### Step-by-Step Text Solution:

1. **Identify the Group**: Lithium is the first member of the alkali metals group, which includes sodium, potassium, rubidium, cesium, and francium.

2. **Size and Electronegativity**: Lithium is unique among the alkali metals because it has the smallest atomic size and the highest electronegativity. This means that lithium atoms are smaller and more effective at attracting electrons compared to other alkali metals.

3. **Reactivity with Nitrogen**: One of the most significant differences is that lithium is the only alkali metal that reacts directly with nitrogen gas (N₂) to form lithium nitride (Li₃N). The reaction can be represented as:
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