Question

50 points ☺

Chemistry.. Class 11
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Q. Write all the exceptions of Electron Gain Enthalpy (∆Heg) along a group as well as period.
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➡PLEASE GIVE RELEVANT ANSWERS​

Answer 1

Explanation:

Variation in electron gain enthalpy in the period:

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In the modern periodic table, on moving from left to right across a period,

the atomic size of elements decreases and the effective nuclear charge increases. ...

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Variation of electron gain enthalpy in a group:

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Generally, when we move down in a group becomes less negative.

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Answer 2

Answer:

In the case of Chlorine and Fluorine, Chlorine has a higher negative electron gain enthalpy value.

This is due to its small size. As a result of its small size, the electron-electron repulsion in the relatively compact to 2p subshell are comparatively large. Hence the incoming electron is not accepted with the same ease as is the case with chlorine.

In between Sulphur and Oxygen, Sulphur has a higher negative value than oxygen

The Electron Gain Enthalpy of Noble Gases is Positive

The atoms of these elements have completely filled subshell. As a result, there is no room in their valence orbitals and the additional electron has to be placed in an orbital of next higher shell. As a result, energy has to be supplied to add on additional electrons.

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