Multiple Choice
Which of the following represents the ground-state electron configuration for cesium (Cs)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5?
A
Chromium (Cr)
B
Manganese (Mn)
C
Cobalt (Co)
D
Iron (Fe)
Verified step by step guidance1
Identify the total number of electrons in the given electron configuration: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^5$. Add the superscripts to find the total number of electrons.
Calculate the total electrons: $2 + 2 + 6 + 2 + 6 + 2 + 5 = 25$ electrons in total.
Recall that the atomic number of an element equals the number of electrons in a neutral atom. So, the element with 25 electrons has an atomic number of 25.
Use the periodic table to find the element with atomic number 25. This element is Manganese (Mn).
Confirm that the electron configuration matches the expected configuration for Manganese, which is $[Ar] 4s^2 3d^5$, consistent with the given configuration.
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