Question

15. Give Reason :- (a) Atomic size increases down a group

(b) a periodic recurrence of properties of elements.
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Answer 1

• atomic size increase down the group because by loving downward in a group a new shelly adds up
• periodic recurrence is due to the number of valence electron in each shell for example both Na and K have 1 atom in their valence shell and hence have similar properties

Answer 2

that's the answer u needed..................