Multiple Choice
Which of the following represents the complete electron configuration of a neutral scandium (Sc) atom?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following is the full electron configuration for titanium (Ti)?
A
1s^2 2s^2 2p^6 3s^2 3p^6 3d^4
B
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^4
C
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^2
D
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4d^2
Verified step by step guidance1
Identify the atomic number of titanium (Ti), which is 22. This means titanium has 22 electrons to place in its electron configuration.
Recall the order of filling orbitals according to the Aufbau principle: 1s, 2s, 2p, 3s, 3p, 4s, then 3d.
Start filling the orbitals with electrons in the order of increasing energy levels until all 22 electrons are assigned: 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, and then 3d electrons.
Count the electrons assigned so far: 2 (1s) + 2 (2s) + 6 (2p) + 2 (3s) + 6 (3p) + 2 (4s) = 20 electrons, leaving 2 electrons to be placed in the 3d orbital.
Write the full electron configuration for titanium as: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^2$, which correctly accounts for all 22 electrons.
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