The unique feature of the first energy level of electrons is that it can only hold two electrons. This is due to the fact that the first energy level contains only one sublevel (the 1s orbital), which can hold a maximum of two electrons (with opposite spins) according to the Pauli Exclusion Principle.
What is unique about the first energy level of electrons?
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The number of electrons it can hold changes with each period.
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It can only hold two electrons.
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It is filled last when drawing the electron dot structure.
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It can hold an odd number of electrons.
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