Why is the standard electron gain enthalpy for F negative but that for Be is positive?
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Why is the standard electron gain enthalpy for F negative but that for Be is positive?
Homework Answers
First understand that electron gain enthalpy is the amount of energy released when one mole of isolated gas atom or ion accepts a single electron.
For F it has high affinity for accepting a electron as it has 7 valence electron and by gainining 1 electron it becomes stable hence the energy is released thats why dH is negative
on the other hand , Be is 1s2 2s2 which has already complete octet. so it does not have any tendency to gain electron so if the electron is added then energy must be supplied hence dH is positive
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Why is the standard electron gain enthalpy for F negative but
that for Be is positive?
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