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In an orbital diagram, which rule states that electrons must occupy orbitals singly before pairing up within a subshell?
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10. Periodic Properties of the Elements
The Electron Configuration
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How many electrons can the first energy level (closest to the nucleus) hold before it is full?
A
4
B
6
C
8
D
2
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Understand that the first energy level corresponds to the principal quantum number \(n=1\).
Recall that each energy level contains one or more sublevels (orbitals), and the first energy level has only one sublevel: the 1s orbital.
Know that each orbital can hold a maximum of 2 electrons with opposite spins, according to the Pauli exclusion principle.
Since the first energy level has only the 1s orbital, the total number of electrons it can hold is the capacity of that single orbital.
Therefore, the first energy level can hold a maximum of 2 electrons before it is full.
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