Question

Write at least five salient features of Modern
Periodic Table.​

Answer 1

Answer:

#First period contains two elements, corresponding to the filling up of 1s1 and 1s2 configuration.

#Second & third period have eight elements each filling up of subshells of s2p6 configuration.

Fourth and fifth have 18 elements, each filling up the sub shells of s2d10p6

#Sixth and seven period have 32 elements, filling up the subshells of s2f14d10p6

#Fourteen elements filling up the f-subshell in the sixth and seventh period are, written separately.

#Fourteen elements following Lanthanum are, called lanthanides and similarly, fourteen elements following actinium are, called actinides.