Multiple Choice
Given the following orbital diagram, which element does it represent?1s: ↑↓2s: ↑↓2p: ↑↓ ↑↓ ↑↓3s: ↑↓3p: ↑↓ ↑↓ ↑↓4s: ↑↓3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓Choose the correct element.
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10. Periodic Properties of the Elements
The Electron Configuration
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Which species has the electron configuration [Ar] 3d^2?
A
Cr^{4+}
B
Ti^{2+}
C
Sc^{+}
D
V^{3+}
Verified step by step guidance1
Identify the electron configuration of the noble gas Argon (Ar), which corresponds to the electron configuration of 1s^2 2s^2 2p^6 3s^2 3p^6, totaling 18 electrons.
Understand that the notation [Ar] 3d^2 means the species has the electron configuration of Argon plus 2 electrons in the 3d subshell, so the total number of electrons is 18 (from Ar) + 2 = 20 electrons.
Determine the atomic number of each neutral element given in the options: Cr (24), Ti (22), Sc (21), and V (23).
Calculate the number of electrons for each ion by subtracting the charge from the atomic number: for example, Ti^{2+} has 22 - 2 = 20 electrons.
Match the total number of electrons to the configuration [Ar] 3d^2 (20 electrons) to find which species corresponds to this configuration.
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