Multiple Choice
Which of the following statements correctly describes the electron configuration of the central oxygen atom in the hydronium ion (H3O+)?
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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 4p5?
A
Iodine (I)
B
Krypton (Kr)
C
Bromine (Br)
D
Selenium (Se)
Verified step by step guidance1
Identify the total number of electrons represented by the given electron configuration: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^5$. Add the superscripts to find the total electron count.
Recall that the atomic number of an element equals the number of electrons in a neutral atom. Use the total electron count to determine the atomic number of the element.
Compare the atomic number found with the periodic table to identify the element corresponding to that atomic number.
Recognize that the electron configuration ends in $4p^5$, which indicates the element is in group 17 (halogens) of the periodic table.
Confirm that the element with atomic number matching the total electrons and ending in $4p^5$ is Bromine (Br).
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