Question

How do you classify elements into metals and non-metals on the basis
of their electronic configuration? 23 11A 19 '9 B, 24 12 C 31 15D

Answer 1

on the basis of electronic configuration if an element has 1,2,3 electrons in its valence shell it is a metal
if the elements has 5,6,7 valence electrons it is a non metel
the reason is due to Octate rule every element tries to maintain 8 electrons in its valence shell, so metals easily lose electrons and non metals gain electron
for example you have been given 23 ,11 A
A has 11 electrons having electronic configuration 2,8,1 so it will lose electron to complete octate rule and will be 2,8 a metal

Answer 2

Explanation:

i) Elements which contain 1 to 3 electrons in their outermost shell are metals. Elements containing 4 to 7 electrons in their valence shell are non-metals.

Hence A and C are metals whereas, B, D and E are non-metals.