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Which of the following is the correct ground-state electron configuration for an atom with 104 electrons?
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10. Periodic Properties of the Elements
The Electron Configuration
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Which element has the following orbital diagram? 1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
A
Ni
B
Zn
C
Fe
D
Cu
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Identify the total number of electrons represented in the orbital diagram by counting all the arrows (each arrow represents one electron).
Sum the electrons in each subshell: 1s (2), 2s (2), 2p (6), 3s (2), 3p (6), 4s (2), and 3d (10). Add these numbers to find the total electron count.
Recall that the electron configuration corresponds to the atomic number of an element, which equals the total number of electrons in a neutral atom.
Compare the total electron count to the atomic numbers of the given elements: Ni (28), Cu (29), and Zn (30).
Determine which element's atomic number matches the total electrons counted, confirming the element represented by the orbital diagram.
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