Question

Wnte scientific reasons.
a. Atomic rodius goes on decreasing
while going from left to right in a period.
b. Metallic character
goes decreasing while going from left to right in a period.
c. Atomic radius goes on increasing down a group
d.Elements belonging to the same group have the same valency.
e. The third period contains only eight elements even through the electron
capacity of the third shell is 18​

Answer 1

Answer:

A bcoz of significant increase in z eff. nuclear force of attraction

B. bcoz of significant increase in repulsion force between electrons

C due to trend of feeling electrons in periodic table

D

Answer 2

Answer:

Explanation:

(i) Atomic radius is the distance between the centre

of the atom to its outermost shell.

(ii) New shells are added to the atoms of the elements

as we go down from top to bottom in a group.

(iii) The outermost electrons go further and further

away from the nucleus, extending the radius and

ultimately increase in the size of the atom. Hence,

atomic radius goes on increasing down a group