Question

Cu has an anomalous electron configuration. write the observed electron configuration of cu.

Answer 1

1s2 2s2 2p6 3s2 3p6 3d10 4s1

Answer 2

Explanation:

Atomic number of copper is 29 and it is a d-block element.The electronic configuration of copper is as follows.

Electronic configuration of copper is $[Ar]4s^1 3d^{10}$

According to the Aufbau principle, in the ground state of an atom or ion the electrons fill atomic orbitals of the lowest energy levels first, before filling the higher energy levels.

But completely filled d-shell is more stable in nature. Hence, one electron from the 4s shell goes into the d-orbital so the copper atom can attain stability.

So, when a copper atom loses an electron then it goes out from the 4s shell first.