Multiple Choice
Which of the following must occur for an electron to move to a higher energy level in an atom?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which noble gas is used as the core in the electron configuration of antimony (Sb)?
A
Ne
B
Ar
C
Xe
D
Kr
Verified step by step guidance1
Understand that the noble gas core in an electron configuration represents the electron configuration of the nearest noble gas preceding the element in the periodic table.
Locate antimony (Sb) on the periodic table; it has an atomic number of 51, meaning it has 51 electrons.
Identify the noble gases with atomic numbers less than 51: Neon (Ne, 10), Argon (Ar, 18), Krypton (Kr, 36), and Xenon (Xe, 54).
Since the noble gas core should be the noble gas with the highest atomic number less than 51, select Krypton (Kr) with 36 electrons as the core.
Write the electron configuration of antimony starting with the noble gas core of Krypton, then add the remaining electrons beyond Kr to complete Sb's configuration.
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