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Which of the following is the correct electron configuration for the Be^{2+} ion?
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10. Periodic Properties of the Elements
The Electron Configuration: Ions
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Which of the following represents the ground state electron configuration of Ti^{4+}?
A
1s^2 2s^2 2p^6 3s^2 3p^6 3d^2
B
1s^2 2s^2 2p^6 3s^2 3p^6
C
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
D
1s^2 2s^2 2p^6 3s^2 3p^6 3d^4
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Identify the atomic number of titanium (Ti), which is 22, meaning a neutral Ti atom has 22 electrons.
Write the ground state electron configuration for neutral Ti by filling orbitals in order of increasing energy: 1s, 2s, 2p, 3s, 3p, 4s, then 3d.
Recognize that Ti^{4+} means the titanium ion has lost 4 electrons compared to the neutral atom.
Remove electrons first from the highest energy orbitals, which for transition metals is the 4s orbital before the 3d orbital.
After removing 4 electrons (2 from 4s and 2 from 3d), write the resulting electron configuration representing Ti^{4+}.
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