Answer :

The number of electrons in an atom of element = 17

The number of protons in the atom = 17


Number of the neutron in the atom = 18


(i) Mass number of the element = (protons + neutrons)


= 17 + 18 = 35


(ii) Electronic configuration is 2, 8, 7


(iii) Valency of the element is 1


The atomic number is 17


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