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Introduction to d and f Block Elements

An element X ...

Question

An element X has two electrons in its valence shell without any core electrons. Identify the group to which it belongs.

A

Group 2

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B

Group 18

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C

Group 12

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D

Group 8

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Solution

The correct option is B Group 18
The element has only $2$ electron. This means the element is He. Helium belongs to group $18$

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