(a) How  is the valency of an element  determined  if its  electronic configuration is k
Channel: Doubtnut
Date: 2020-04-19

(a) How  is the valency of an element  determined  if its  electronic configuration is known?  Determine  the valency   of an  element of  atomic no. 9     (b) Given  below  are some  elements  of the Modern Periodic Table. Atomic  numbers of  the elements are given in the parentheses:    A(4), B(9), C(14), D(19), E(20)    (i) With the help of the electronic configuration, find out which one of the above elements will have one electron in its outermost shell?   (ii) Which rwo elements belong to the same group? Give reasons for your answer.   (iii)  Which one of the above elements belonging to the fourth period has bigger atomic radius and why?.