Question

How the valency of an element is determined if its electronic configuration is known?

Determine the valency of an element of atomic number 9.



b. Given below are some elements of the Modern Periodic Table. Atomic numbers of

the elements are given in 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 electrons in its outermost shell.


ii. Which two 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?​

Answer 1

Answer:

How the valency of an element is determined if its electronic configuration is known?

Determine the valency of an element of atomic number 9.

b. Given below are some elements of the Modern Periodic Table. Atomic numbers of

the elements are given in 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 electrons in its outermost shell.

ii. Which two 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?