Question

Which of the following has most negative value of electron gain enthalpy- S Se O Te

Answer 1

Answer:

S has high electron gain enthalpy because in sulphur there is more inter-electronic repulsion than oxygen, therefore, more energy is released in case of sulphur on gaining electrons.

Answer 2

Answer:

S has most negative value of electron gain enthalpy among O, S, Se, Te.

Explanation:

• The energy that is released or absorbed when a neutral atom accepts an electron in its gaseous state is called electron gain enthalpy.
• Heat released due to electron gain enthalpy would be denoted as negative.
• This is because of fairly small size of oxygen than Sulphur and hence, oxygen cannot accommodate more electrons and thus need extra energy which increases positive electron gain enthalpy.
• Also since, larger size decreases nuclear attraction, negative electron gain enthalpy decreases.
• Hence, Sulphur has most electron gain enthalpy with a negative sign among all 16 group elements.

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