Question

15. which of the following atoms has the smallest size
a). K b). Na c).B d). C​

Answer 1

HERE IS YOUR ANSWER....ʘ‿ʘ

The correct one is C{Carbon}.....!!!

✓✓How it's going to be correct let's see✓✓

#As we know that when we move left to right in a period...atomic size decreases due to increase in effective nuclear charge...So in the case of boron and carbon(boron is in left and carbon is in right side) carbon has a smaller size than boron..!!!

#As we know that in group when we move from top to bottom....atomic size increases due to increase in the number of shells...So in the case of Pottasium and sodium (Sodium is in the top of pottasium) sodium is going to be smaller in size...

So now we have Sodium & Carbon...(after eliminating biggest ones)

1. Vanderwall radii of sodium is 227pm

2. In the case of carbon ... vanderwall radii of Carbon is 170pm

So now it's crystal clear that carbon has smaller ionic/vanderwall radii

That's why....it is smallest among them

HOPE TO BE HELPFUL...

THANKS