3
AssignmentMultiple Choice

Electrons and the Periodic Table

Question 3 • Chemistry Honors A

Argon (Ar): [Ne]3s23p6

Answer
A
longhand notation
B
noble-gas notation

Explanation

The notation [Ne]3s²3p⁶ uses the symbol of the previous noble gas, neon, to represent argon’s inner electrons. This shortened form is called noble-gas notation. Longhand notation would list every occupied orbital, beginning with 1s².

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