However , the Cr ions are larger and have electron orbitals in different directions than aluminum .
When a chromium atom replaces an occasional aluminum atom , it too loses 3 electrons to become a chromium ion to maintain the charge balance of the Al O crystal .
The Cr ions are larger and have electron orbitals in different directions than aluminum .
When a chromium atom replaces an occasional aluminum atom , it too loses 3 electrons to become a chromium ion to maintain the charge balance of the Al O crystal .