Name the alkali metals which combine directly with nitrogen.

Explanation

To solve the question of which alkali metals combine directly with nitrogen, we can follow these steps:

### Step 1: Understand Alkali Metals
Alkali metals are a group of elements found in Group 1 of the periodic table. They include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These metals are known for their high reactivity, especially with nonmetals.

**Hint:** Remember that alkali metals are highly reactive and belong to Group 1 of the periodic table.

### Step 2: Identify Reactivity with Nitrogen
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