Question

Why are sodium and potassium kept in the same group of modern periodic table?​

Answer 1

Answer:

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Sodium and potassium have same number of valence electron 1, hence they belong to same group. The group is called alkali metals group because all this elements from oxide which dissolve in water to form alkali.

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Answer 2

Explanation:

Lithium, sodium and potassium have same number of valence electron i.e. 1, hence they belong to same group. The group is called alkali metals group because all these elements form oxides which dissolve in water to form alkali.

Hope it helps.