An element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d10 7p6. Which of the following statements about this element is correct?
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Correct answer
A. It is a noble gas.
Principle or equation
The electron configuration ends with completely filled s and p subshells (ns2 np6) for the outermost shell, indicating a noble gas.
Why this answer is correct
The configuration ends with 7p6, which is a completely filled p subshell, so the element is a noble gas (oganesson, element 118). Noble gases have stable, filled valence shells.
Example
Neon has configuration 1s2 2s2 2p6, ending with 2p6, and is a noble gas.
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