Question 18.
Write scientific reasons.
Atomic radius goes on increasing down a group.
Answer:
Atomic radius goes on increasing down a group because:
⇒ Down a group, the atomic number increases one by one as a result nuclear charge increases.
⇒ The outer electrons are adding in a new valence shell.
⇒ Therefore, the distance between the outermost electron (valence electron) and the nucleus is also increasing
⇒ Therefore, the size of the atom increases with increase I atomic number.
Number of shells are increasing down a group
