3
AssignmentMultiple Choice

The History and Arrangement of the Periodic Table

Question 3 • CA-Chemistry A

Argon (Ar): [Ne]3s23p6

Answer
A
longhand notation
B
noble-gas notation

Explanation

The notation [Ne]3s²3p⁶ uses the symbol for the preceding noble gas, neon, to stand in for argon’s inner electrons. This shortened form is called noble-gas notation. Longhand notation would list every occupied subshell without the [Ne] shorthand.

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