(a) Explain Bohr and Bury rules for distrubution of electrons into different shells.
(b) Draw the electronic structure of element X with atomic number 17 and element y with atomic number 16?

Explanation

(a) Fro Bohr and Bury rules , consult section 4.9
(b) For electronic structure of elements x nd Y , consult section 4.9 (Table : Electronic configruation of first 20 elements)