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2.23    (ii) What are the atomic numbers of elements whose outermost electrons are represented by

   (a)    \textup{3s}^1

    

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With given outermost electrons \textup{3s}^1,

The complete electronic configuration is 1s^22s^22p^63s^1

Hence the number of electrons present in the atom of the element is:

= 2+2+6+1 = 11.

Therefore, the atomic number of the element is 11 which is Sodium (Na).

Posted by

Divya Prakash Singh

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