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Electronegativity

On descending...

Question

On descending a group in the periodic table nuclear charge increases but electronegativity decreases.

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Solution

Electronegativity is the chemical property that describes the tendency of an atom or a functional group to attract electrons towards itself.
When we move from top to bottom in the periodic table the nuclear charge and atomic size increase.
But the increase in atomic size pacify the increase in nuclear charge due to this the electronegativity decreases while moving down.

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Similar questions

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.

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.

Q. Question 48(e)
(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 element which shows maximum valency.

Q. Give reason down a group the electronegativity should increase with increase in nuclear charge but it is seen that electronegativity decreases

Q. Nuclear charge increases both in a period and group. But, effective nuclear charge increases in a period and decreases in a group. Identify the correct reverse trend.

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