Question

A new electron entres the orbital at where

Answer 1

Answer:

an electron enters the orbital having lowest (n+l) value.for If any 2 orbitals have same (n+l) value,then the electron will enter the one having lowest principal quantum number value(n).

n=4 and l=0 that is 4s , n+l = 4

n=3 and l=1 that is 3p, n+l=4

But they have different energy and same value of (n+l). Smaller the value of n smaller will be the energy and hence 3p is filled first.

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