Electron gain enthalpies of beryllium and magnesium are positive. Give reason.
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Electron Gain enthalpy also known as electron affinity is the amount of energy released when an electron is added to the valence shell of neutral gaseous atom .
A(g)+electron -----> A(g) ⁻ ;EA=Δ H
it is measured in electron volts pr atom or kJ/Mole.
Electron gain enthalpies of Be and Mg are positive because of the following reasons:
1 .Be and Mg are electropositive in nature.
2. They belong to Group 2 .They have fully filled s orbitals and addition of new electron would move to the higher energy p .
3. This addition of new electron is very energetically unfavorable and so this accounts for the more positive electron affinity.
A(g)+electron -----> A(g) ⁻ ;EA=Δ H
it is measured in electron volts pr atom or kJ/Mole.
Electron gain enthalpies of Be and Mg are positive because of the following reasons:
1 .Be and Mg are electropositive in nature.
2. They belong to Group 2 .They have fully filled s orbitals and addition of new electron would move to the higher energy p .
3. This addition of new electron is very energetically unfavorable and so this accounts for the more positive electron affinity.
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