give reason (a) electron gain enthalpy of S is greater than that of oxygen, whereas electro negativity of oxygen is greater than sulphur
Answers
Explanation:
The negative electron gain enthalpy is more in sulphur than in oxygen because, both of them are in 16th group in which oxygen is 1st element which has the minimum size and sulphur has larger size due to addition of a new shell.
⏪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 .
⏪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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