Given the Following electron configurations, answer the questions that follow: A

Question

Given the Following electron configurations, answer the questions that follow:   

A: 1s2 2s2 2px1 2py1 2pz1

B:  1s2 2s2 2px2 2py1 2pz0

C:  1s2 2s2 2px2 2py1 2pz1

D:  1s2 2s2 2px2 2py2 2pz1

E:  1s2 2s2 2px3 2py1 2pz0

F:  1s2 2s2 2px1 2py1 2pz0 3s1

G:  1s2 2s2 2px2 2py2 2pz2

H:  1s2 2s2 2px2 2py2 2pz2 3s1

a) Which configuration does not follow the aufbau principle?

b) Which configuration does not obey Hund's rule?

c) Which configuration does not obey Pauli's exclusion principle?

d) Which configuration is that for oxygen in its ground state?

I need help with this. please explain why you choose every answer.

Explanation / Answer

a) Which configuration does not follow the aufbau principle? It says that filling of electrons in orbitals is in increasing order of energy level of orbitals.

Answer = F:  1s2 2s2 2px1 2py1 2pz0 3s1

b) Which configuration does not obey Hund's rule? It says that in case of degenerate orbitals pairing will takes place only if all the orbitals are singly occupied.

Answer = B:  1s2 2s2 2px2 2py1 2pz0   E:  1s2 2s2 2px3 2py1 2pz0

c) Which configuration does not obey Pauli's exclusion principle? It says that no two electrons in an orbital has all the four quantum numbers same.

Answer = no suitable answer in the given options.

d) Which configuration is that for oxygen in its ground state?

Answer = C:  1s2 2s2 2px2 2py1 2pz1

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