Practice question
Question
Which element has the electronic configuration ending in 4s² 4p³ in its ground state?
Explanation
The configuration 4s² 4p³ corresponds to As (Z=33, period 4, group 15), with full configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p³.
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