Question

CBSE SCIENCE BOARD PAPER 2020 QUESTION 1

Answer 1

Explanation:

when we go down the group number of shells increases which dominate effective nuclear charge hence atomic radius increases down the group.

Hope it helps you out

Answer 2

1). Electropositivity may be defined as the ability of an atom to withdraw a shared pair of electrons in its combined state .

2). The atomic radii of first group element is increased down the group .

• The reason of these trend is that an additional shell is added in the atom when going down in period .
• The addition of the shell dominate over other effects and hence, the atomic radii increases .