Multiple Choice
Which of the following is the correct electron configuration for the Ti^{2+} ion?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following represents the correct electron configuration for a neutral atom of helium?
A
1s^1 2p^1
B
1s^2
C
2s^2
D
1s^1 2s^1
Verified step by step guidance1
Recall that helium (He) has an atomic number of 2, which means it has 2 electrons in its neutral state.
Understand that electron configurations are written by filling orbitals in order of increasing energy, starting with the 1s orbital.
The 1s orbital can hold a maximum of 2 electrons, so for helium, both electrons will occupy the 1s orbital.
Write the electron configuration by placing 2 electrons in the 1s orbital, which is represented as $1s^{2}$.
Verify that the other options are incorrect because they either place electrons in higher energy orbitals prematurely or do not account for the total number of electrons in helium.
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