Which of the following elements are alkali metals?

Aluminium

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Calcium

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Potassium

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Sodium

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Solution

The correct options are
C Potassium
D Sodium
Alkali metals belong to the first group of the periodic table. These elements have one valence electron. In the given options sodium and potassium has one valence electron. So they belong to 1st group and are alkali metals.

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