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Classification of Elements and Periodicity in Properties
Explain giving various reasons for the variation of electronegativity along a period and along a group.
(i) Variation of electronegativity in a period: In a period electronegativity increases in moving from left to right. This is due to the reason that nuclear charge increases whereas atomic radius decreases as we move from left to right in a period. Halogens have the highest value of electronegativity in their respective period.
(ii) Variation of electronegativity in a group: In a group, electronegativity decreases on moving down the group. This is due to the effect of increased atomic radius. For example among halogens, fluorine has the highest electronegativity.
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What are magic numbers?
Which property is the basis of long form of periodic table?
How many elements are placed in each period of the p-block?
What is the number of groups in: (i) p-block (ii) d-block?
How many elements are present in:
(i) second period
(ii) fourth period
(iii) sixth period?
What is the name given to the s-block elements?
To which block the element with outer electronic configuration 4s23d10 belongs?
Why are there 10 elements in each series of d-block?
In terms of electronic configuration,
what is common in a given period and group?
Give the general electronic configuration of
(i) Transition elements (ii) Inner transition elements.
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