Assertion: Elements having atomic number 3 and 11 belong to the same group.

Reason: Elements having same number of valence electrons are placed in the same group.

A is true but R is false.

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A is false, but R is true.

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Both A and R are true, and R is not the correct explanation of A.

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Both A and R are true, and R is the correct explanation of A.

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Solution

The correct option is D Both A and R are true, and R is the correct explanation of A.
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Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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