7
AssignmentMultiple Choice

The History and Arrangement of the Periodic Table

Question 7 • CA-Chemistry A

Argon (Ar): [Ne]3s23p6

Answer
A
longhand notation
B
noble-gas notation

Explanation

The notation [Ne] uses the symbol of the previous noble gas to represent argon’s inner electrons, then shows the remaining electrons as 3s²3p⁶. This is noble-gas notation, so the correct choice is B, noble-gas notation.

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