Multiple Choice
Which of the following orbital diagrams for the 2p subshell of carbon (atomic number 6) represents a violation of Hund's rule?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following is the correct electron configuration for helium (He)?
A
1s1
B
1s22s1
C
1s22s2
D
1s2
Verified step by step guidance1
Recall that helium (He) has an atomic number of 2, which means it has 2 electrons.
Understand that electron configurations describe the distribution of electrons in atomic orbitals, following the Aufbau principle, Pauli exclusion principle, and Hund's rule.
Start filling electrons into the lowest energy orbital first, which is the 1s orbital. Since helium has 2 electrons, both will occupy the 1s orbital.
Write the electron configuration by placing both electrons in the 1s orbital, which is represented as $1s^2$.
Compare the given options to the correct configuration $1s^2$ and identify that the correct answer is the one showing $1s^2$.
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