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Electrons enter into orbitals in order of increasing ener...

Electrons enter into orbitals in order of increasing energy as exemplified by?

A.

1S $^2$ 2S $^2$ 2PX $^2$ 2py $^2$ 2pz $^0$ 3s $^0$

B.

1S $^2$ 2S $^2$ 2PX $^2$ 2py $^1$ 2pz $^1$ 3s $^0$

C.

1S $^2$ 2S $^2$ 2PX $^1$ 2py $^1$ 2pz $^1$ 3s $^1$

D.

1S $^2$ 2S $^2$ 2PX $^2$ 2py $^2$ 2pz $^0$ 3s $^1$

View answer & explanation

Correct answer is B

Shells and subshells are filled in energy level order, so electrons will fill the 2p subshell before the 3s shell.

And the x subshell before the y and z.

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