Question

Positive electron gain enthalpy is shown by
(1) Ne
(2) o-
(3) F
(4) Both (1) & (2)
Give me with proper explanation plz
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Answer 1

Answer:

The answer is (1)

Explanation:

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Answer 2

Positive electron gain enthalpy is shown by $O^{-}$.

Explanation:

• Positive electron gain enthalpy is defined as the amount of heat energy added to an atom in order to add an electron. When an atom contains more number of electrons then in order to add another electron we need to supply heat energy.

• This is because more is the number of electrons present in an atom more will be the electronic repulsion present within it. Hence, addition of another electron won't be easily possible. Therefore, heat energy has to be supplied to the atom.

• For example, $O^{-}$ will have positive gain enthalpy as it contains more number of electrons. Ne is neutral in nature because it has completely filled orbital so, it will neither gain or lose an electron.

• Also, fluorine is highly electronegative in nature so it will readily accept an electron in order to completely fill its valence shell. Therefore, fluorine will have a negative electron gain enthalpy.

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