Question

The four quantum numbers for valence electron(last electron) in helium are:​

Answer 1

Answer:

When ℓ = 0, there is only one possible choice for mℓ, which must be zero. The first electron in helium has exactly the same four quantum number of the first electron in hydrogen. However, helium has TWO electrons.

...

Boron - five electrons.

ℓ mℓ

1 -1

1 0

1 +1

Explanation:

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