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(ii) What are the atomic numbers of elements whose outermost electrons are represented by (c) 3p5

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

            (c)    3p^5

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With given outermost electrons 3p^5,

The complete electronic configuration is 1s^22s^22p^63s^23p^5

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

= 2+2+6+2+5= 17.

Therefore, the atomic number of the element is 17 which is Chlorine (Cl)

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