Question

Why beryllium and magnesium have low electron gain enthalpy

Answer 1

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.

Answer 2

because they gives electron to have stable electronic configeration