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  • (iii) Which atoms are indicated by the following configurations? (a) [He]2s1

2.23    (iii) Which atoms are indicated by the following configurations?

                (a)    \left [\textup{He} \right ]2s^1

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The electronic configuration of the element is \left [\textup{He} \right ]2s^1 or 1s^22s^1.

Therefore, the atomic number of the element is 3 which is Lithium, a p-block element.

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Divya Prakash Singh

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