Q41 of 59 Page 32

The radius of Na+ cation is less than that of Na atom. Give reason.

Sodium atom loses one electron to form sodium cation and after the formation of a cation the effective nuclear charge on the ion increases on the left electrons which results a decrease in radius.


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39

Explain the following:

(a) Electronegativity of elements increase on moving from left to right in the periodic table.


(b) Ionisation enthalpy decrease in a group from top to bottom?


 40

How does the metallic and non-metallic character vary on moving from left to right in a period?

 42

Among alkali metals which element do you expect to be least electronegative and why?

 43

Match the correct atomic radius with the element.