Practice question
Question
Which element has the ground state electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹?
Explanation
This configuration (Z=31) corresponds to Ga (period 4, group 13), with 4p¹ distinguishing it from Zn (4p⁰), Ge (4p²), or As (4p³).
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