Question

write the condensed (noble - gas) electron configuration of cu²⁺. for multi - digit superscripts or coefficients, use each number in succession.

Explanation:

Step1: Determine the atomic number of Cu

The atomic number of Cu (copper) is 29.

Step2: Find the noble - gas core

The noble - gas core for Cu is [Ar] (argon has an atomic number of 18).

Step3: Determine the electron configuration of Cu

The electron configuration of Cu is [Ar]4s¹3d¹⁰ (due to the stability of the half - filled and completely filled d - orbitals).

Step4: Remove electrons for Cu²⁺

When forming Cu²⁺, we remove 2 electrons. We first remove the 4s electron and then one 3d electron.

Answer:

[Ar]3d⁹