Alkali metals are kept under ........because they are highly........and get .....when exposed to air.

Explanation

To answer the question, "Alkali metals are kept under ........because they are highly........and get .....when exposed to air," we can break it down into three parts:

1. **What are alkali metals kept under?**
- Alkali metals are kept under **oil** or **inert solvents**. This is to prevent them from reacting with moisture and oxygen in the air.

2. **Why are they highly reactive?**
- Alkali metals are highly **reactive** because they have only one electron in their outermost shell. This single electron can be easily lost, making them prone to oxidation.

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