Question

write subshell configuration of chromium and copper also explain about the stability of the atoms​

Answer 1

Answer:

chromium and copper are the 2 exceptions in periodic table

Explanation:

chromium have electronic configuration of[Ar] 3d⁵ 4s¹This happens in Chromium, as one 4s electron moves to the 3d sublevel. There are two main reasons: The 3d orbital is slightly lower in energy, and minimizing repulsions in the 4s orbital by moving one of the 4s electrons to a close-lying 3d orbital minimizes the ground-state energy of chromium

in terms of copper of electronic configuration

[Ar] 3d¹⁰ 4s¹In these cases, a completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital.

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