Multiple Choice
Which of the following represents the correct ground-state electron configuration for the Mn^{2+} ion?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6?
A
Radon (Rn)
B
Xenon (Xe)
C
Barium (Ba)
D
Krypton (Kr)
Verified step by step guidance1
Identify the total number of electrons represented by the given electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6. Count the electrons in each subshell and sum them up.
Recall that the atomic number of an element equals the total number of electrons in its neutral state. Use the total electron count to find the atomic number of the element.
Match the atomic number to the corresponding element on the periodic table. This will help you identify which element has the given electron configuration.
Note that the given configuration ends at the 5p6 subshell, which corresponds to a noble gas in the fifth period of the periodic table.
Compare the options provided (Radon, Xenon, Barium, Krypton) with the element identified by the atomic number and electron configuration to select the correct answer.
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