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Write scientific reasons. Atomic radius goes on increasing down a group.

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