Question

Q: Why does Sulphur has more negative electron gain enthalpy than Oxygen ? [ atomic no. of O = 8 , S = 16 ]

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Answer 1

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The release of energy is represented by negative values.

The atom in order to gain stability tends to gain electrons...

Sulphur has more negative electron gain enthalpy than oxygen because when an electron is added to oxygen the added electron goes to smaller n=2 quantum level... Due to smaller size the inter electron repulsion increases causing the decrease in electron gain enthalpy values ...

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Answer 2

Heya!!Here is your answer friend ⤵⤵
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⏪Electron Gain Enthalpy : it is the energy released when an electron is added to a neural gaseous atom. The values of Electron Gain Enthalpy are always negative .

➡Factors Affecting Electron Gain Enthalpy:

⏪Nuclear Charge

⏪Size of the Atom

⏪Electronic configuration

↔Variation in a period : becomes more negative as we move left to right in a period .

↔Variarion in a group :It becomes less negative as we move down the group .

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⏪Among Sulphur ( 16) and Oxygen (8) SULPHUR will have a more negative Electron Gain Enthalpy value .

The configuration of Oxygen - 1s2,2s2 , 2p4.

The configuration of sulphur - 1s2 , 2s2 2p6, 3s2 and 3p4.

➡Now , they both belong to the same group (16) but oxygen comes before sulphur . So it's Atomic Size is more than sulphur .

➡And with the Increase in Atomic Size , the distance between the nucleus and the incoming electron increases and thus results in lesser attraction. Consequently, the electron gain enthalpy becomes less negative.


↘↖Thus,the electron gain enthalpy of Sulphur is more negative .

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