Question

Why are Sodium and potassium called soft metal?

Answer 1

Answer:

Explanation:

Beacause they can be easily cutted by knife.

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Answer 2

Sodium has larger atomic size because of less force of attraction between the valence electron and the nucleus, hence it is soft. You can also find that Potassium is more softer than Sodium, Rubidium being more softer than Potassium, and this goes on.