Q40 of 59 Page 32

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

When we move from left to right in a period then the metallic character decreases and non-metallic character increases as there is an increase in ionisation enthalpy and electron gain enthalpy along the period.


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38

Explain the deviation in ionisation enthalpy of some elements from the general trend by using Fig. 3.2.


 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?


 41

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

 42

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