The electronegativity energy of the He+ ion is 5250 kJ/mol.
What is electronegativity?
electronegativity is the measure of capability of an element to enter into chemical reactions requiring ion formation or donation of electrons.
You are given the expression for the energy of the electron:
When the electron is in its ground state, the value of the principle quantum number
can take values 1, 2, 3, 4..... etc.
For these higher energy levels you can see that the value of
1n2
will get smaller and smaller.
The means that the gap in energy between successive energy levels gets less and less such that they converge and eventually coalesce.
At this point as
n
tends to infinity so
1n2
tends to zero.
An electron excited to this point can be regarded as ionised i.e it has left the atom.
The difference in energy between these levels will represent the ionisation energy.
For He+
there are 2 protons in the nucleus -
2.18×10^-18×2^2/1 = 8.72 ×10^-18j
To convert to kJ divide by 1000 To 8.72× 10^-21 kj
This is the energy required to ionise a single
He+ ion
To find the energy required to ionise a mole of ions you need to multiply by The Avogadro Constant which is 6.02×10^ 23 mol^-1
8.72×10^-21×6.02×10^23 = 5250 kj/mol.
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