We’re being asked to determine the correct noble gas electron configuration Cr3+ and Cu2+.
Before we can do that, we have to first write the electron configuration of a neutral ground state chromium (Cr).
You can determine the ground-state electron configuration of Chromium (Cr) by locating its position in the periodic table.
You see from the periodic table that Cr is in Period 4 and d-block
• Before reaching Cr, you will pass through the atomic orbitals 1s, 2s, 2p, 3s, 3p, 4s, 3d
• In a neutral atom:
Atomic number = # of protons = # of electrons
Cr: atomic number = 24 → 24 protons & 24 electrons
• Distribute electrons in the atomic orbitals:
Write the electronic configuration for:
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