Multiple Choice
Which of the following represents the electron configuration for the valence electrons in strontium (Sr)?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has the following ground-state electron configuration: [Kr] 5s2 4d10 5p3?
A
Tin (Sn)
B
Antimony (Sb)
C
Indium (In)
D
Tellurium (Te)
Verified step by step guidance1
Identify the noble gas core in the electron configuration, which is [Kr] representing the electron configuration of Krypton (atomic number 36).
Analyze the electrons beyond the [Kr] core: 5s2 means 2 electrons in the 5s subshell, 4d10 means 10 electrons in the 4d subshell, and 5p3 means 3 electrons in the 5p subshell.
Sum the electrons beyond Krypton: 2 (5s) + 10 (4d) + 3 (5p) = 15 electrons beyond atomic number 36, so the total atomic number is 36 + 15 = 51.
Use the atomic number 51 to identify the element on the periodic table, which corresponds to Antimony (Sb).
Confirm that the electron configuration matches the expected configuration for Antimony, ensuring the 5p subshell has 3 electrons, consistent with the group and period of Sb.
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