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Trend in Electronegativity

In a period f...

Question

In a period from alkali metal to halogens, the electronegativity :

A

gradually increases

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B

gradually decreases

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C

gradually increases except in IIA and VI group elements

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D

gradually decreases except in IIA and VI group elements

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Solution

The correct option is A gradually increases
As the size decreases, affinity to attract electrons increases from left to right in a period, hence electronegativity decreases.

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Q. Question 48 (b)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electronegative element.

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

(ii) Ionisation enthalpy decreases in a group from top to bottom.

Except carbonates and bicarbonates for all other oxo salts solubility in water increases down the group for alkali metals . Explain.

Q. The alkali and alkaline earth metals in groups

I A

I I A

are referred to as the light metals because, they have:

(a) Electropositive nature of the element(s) increases down the group and decreases across the period.
(b) Electronegativity of the element decreases down the group and increases across the period.
(c) Atomic size increases down the group and decreases across a period (left to right).
(d) Metallic character increases down the group and decreases across a period.

On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the most electronegative element :

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