A) ionisation potential of Na is greater than K
B) size of Na is smaller than K
C) atomic weight of K is greater than Na
D) only eight electrons are present in third shell of K
Correct Answer: D
Solution :
The density of Na is higher than K because only eight electrons are present in third shell of potassium while the capacity of third shell is 18 electrons. Further more lower density of K is due to abnormal increase in size of K.
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