Question

Unlike the hydrogen atom, in the case of the helium atom the energy is quantized by...

Unlike the hydrogen atom, in the case of the helium atom the energy is quantized by two quantum numbers (not just the primary quantum number n as is the case for H). This is due to

(a) Hydrogen forms a diatomic molecule unlike He

(b) He is a larger atom

(c) He has more electrons

(d) He has a complete 1s shell

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Answer #1

Answer,-

(d) He has a complete 1s shell

Explanation -

He is quantized by two quantum numbers because of its completely filled 1s shell consisting of

two electrons. Thus , under the situation besides n ,( the principal quantum number ) , the spin quantum

number ( s ) identifying axial motion of the two electrons separately in He atom becomes essential; ie.

1 s2   where , n = 1 & s = +1/2 , -1/2

In case of H :- since there is only one electron in the orbit ( major energy level ), the only electron has

one and the same type of axial motion , so no other quantization is necessary to be given.

In both the cases ; l = 0 & m = 0 , so need not be given .

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