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Question

Which of the following property in a group decrease down the group and increase down the group respectively?


A

electronegativity and atomic radius

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B

electronegativity and electron gain enthalpy

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C

atomic radius and electronegativity

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D

electro gain enthalpy and electronegativity

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Solution

The correct option is A

electronegativity and atomic radius


The exact solution is option (A) electronegativity and atomic radius.

Explanation

On moving down, the group electronegativity decreases. On moving down, the group atomic shell increases thereby atomic radius increases.

Explanation of option (B) why it is incorrect

As we progress through the families, the electron gain enthalpy has been less negative. As we move down a group, the atomic size, and nuclear charge increase. Increasing nuclear charge, on the other hand, has far less effective than increasing atomic size. As a corollary, the enthalpy of electron gain as well as a group's electronegativity both drop.

Explanation of option (C) why it is incorrect

In a group, atomic radius rises whilst electronegativity decreases.

Explanation of option (D) why it is incorrect

As indicated in the explanation of the option, both fall in a group (B).

The concluding statement is that option (A) electronegativity and atomic radius are correct.


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