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Question
The correct order of electron gain enthalpy is :
The correct order of electron gain enthalpy is :
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Solution
The correct option is D S>Se>Te>O
The electron gain enthalpy becomes less negative as we move down a group.
As we move down a group, both the atomic size and the nuclear charge increases. But the effect of the increase in atomic size is much more pronounced than the nuclear charge.
With the increase in atomic size, the attraction of the nucleus for the incoming electron decreases. Hence, the electron gain enthalpy becomes less negative.
Because of the small size leading to repulsion of the incoming electron second period elements (here Oxygen) have low electron gain enthalpy than other element of the column. S has the highest enthalpy.
Correct order of electron gain enthalpy is,
S>Se>Te>O
Hence, (d) is the correct option.
The electron gain enthalpy becomes less negative as we move down a group.
As we move down a group, both the atomic size and the nuclear charge increases. But the effect of the increase in atomic size is much more pronounced than the nuclear charge.
With the increase in atomic size, the attraction of the nucleus for the incoming electron decreases. Hence, the electron gain enthalpy becomes less negative.
Because of the small size leading to repulsion of the incoming electron second period elements (here Oxygen) have low electron gain enthalpy than other element of the column. S has the highest enthalpy.
Correct order of electron gain enthalpy is,
S>Se>Te>O
Hence, (d) is the correct option.
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