Question

b.)if element has 1,2,3,4 Valence Electrons, its valency will be 1,2,3,4 repectively.if element has 5, 6, 7, 8 valence electron its valency will be 3,2,1,0.elements with atomic number 9 has electronic constitution 2, 7 so its balance will be 1

Answer 1

if the valence electrons are more than 4 then the put formula
valency =8- valence electrons