Multiple Choice
In which of the following orbitals would an electron, on average, be closest to the nucleus?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has a total of five occupied principal energy levels?
A
Calcium (Ca)
B
Krypton (Kr)
C
Bromine (Br)
D
Neon (Ne)
Verified step by step guidance1
Understand that the principal energy levels correspond to the main electron shells around the nucleus, labeled as n = 1, 2, 3, 4, 5, etc.
Recall that the number of occupied principal energy levels for an element depends on its electron configuration, which is determined by its atomic number (number of electrons).
Identify the atomic numbers of the given elements: Calcium (Ca) = 20, Krypton (Kr) = 36, Bromine (Br) = 35, Neon (Ne) = 10.
Write or recall the electron configuration for each element and note the highest principal energy level (the largest value of n) that contains electrons.
Determine which element has electrons occupying five principal energy levels (n = 1 through n = 5), which corresponds to the element with electrons in the fifth shell.
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