Multiple Choice
In the context of electron configuration, where are the electrons located within an atom?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which of the following elements has the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 3d^5?
A
Cr (Chromium)
B
Co (Cobalt)
C
Fe (Iron)
D
Mn (Manganese)
Verified step by step guidance1
Identify the total number of electrons represented by the given electron configuration: $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5$. Add the superscripts to find the total electrons: $2 + 2 + 6 + 2 + 6 + 5$.
Calculate the sum of electrons to determine the atomic number, which corresponds to the element's position in the periodic table.
Recall that the electron configuration fills orbitals in order of increasing energy levels, following the Aufbau principle, and that the 3d subshell starts filling after the 4s subshell.
Match the total number of electrons (atomic number) to the element in the periodic table. The element with 3d^5 configuration corresponds to the element with atomic number 25.
Identify the element with atomic number 25, which is Manganese (Mn), confirming that the given electron configuration belongs to Mn.
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