Problem: Which of the following electron configurations is not allowed? a. 1s22s22p5b. 1s22s22p1 c. 1s22s5d. 1s22s22p63s2e. 1s22s22p2

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Aufbau Principle → totally fill in the lowest energy orbital first
Hund’s Rule → electron orbitals that are degenerate (same energy) are first half-filled before they are totally filled  

s orbital → can hold a maximum of 2 electrons
p orbitals → can hold a maximum of 6 electrons
d orbitals → can hold a maximum of 10 electrons
f orbitals → can hold a maximum of 14 electrons

1s  → 2s  →  2p  →  3s →  3p


a. 1s22s22p5 

follows Aufbau Principle and Hund's Rule

orbitals contain less than or equal their maximum capacity

Electron configuration is allowed


b. 1s22s22p

follows Aufbau Principle and Hund's Rule

orbitals contain less than or equal their maximum capacity

Electron configuration is allowed

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Problem Details

Which of the following electron configurations is not allowed? 

a. 1s22s22p5

b. 1s22s22p

c. 1s22s5

d. 1s22s22p63s2

e. 1s22s22p2

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