Same chapter3 marksDifficulty: Medium
State the de Broglie relation and Heisenberg's uncertainty principle.
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3 marksDifficulty: Medium
Write the electronic configuration of copper (Z = 29) and explain the anomaly.
Original Khojo Papers practice question — not from a past board paper.
Answer
[Ar]3d104s1. A completely filled 3d subshell is unusually stable, so one 4s electron is promoted to complete it rather than leaving 3d94s2.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Chromium shows the same effect with a half-filled subshell.
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