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Atomic shorthand uses the noble gas before the element in question

Answer: Cu: [Ar]4s[1]3d[10]

Explanation: Copper Cu is an anomaly. Logically we would write 4s[2]3d[9] but for Cu, having the d sub level full is more stable than having the s sub-shell full and the d sub-shell less than full. Chromium also has this anomaly, and is written [Ar]4s[1]3d[5]

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