The energy released when electron move from n=4 to n=3 is 0.66 eV
We know that in an atom energy of nth state is
eV
where n is the energy level
Therefore,

Thus,
= -0.85eV
= -1.51eV
Therefore, total mount of energy released in moving electron from n=4 to n=3 is given by -

= -0.85 - ( -1.51)
= 0.66eV
To know more about energy released in electron transition
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A. an ion
The atom gains a net electrical charge if the number of protons and electrons are not equal which makes it an ion.
It’s
1.A
2.C
3.B
hope it’s correct