Question

Lithium is less reactive than sodium Why?

Answer 1

Explanation:

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As you have said, Lithium is smaller than Sodium, the valence electron on sodium is further away from the positive nucleus and therefore it has a weaker electrostatic attraction and is more easily lost in a chemical reaction, making it more reactive.

Answer 2

sodium metal is highly reactive

Explanation:

lithium is less reactive because it is in early position in periodic table and sodium is at highly position