Chromium and Copper

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Andrea_1H
Posts: 50
Joined: Wed Sep 18, 2019 12:18 am

Chromium and Copper

Postby Andrea_1H » Sun Oct 27, 2019 8:38 pm

Why are Chromium and Copper exceptions to the Aufbau principle?

Lauren Bui 1E
Posts: 54
Joined: Sat Jul 20, 2019 12:15 am

Re: Chromium and Copper

Postby Lauren Bui 1E » Sun Oct 27, 2019 8:44 pm

For chromium and copper, a completely full (d10) or half full (d5) d sub-level is more stable than a partially filled d sub-level. As a result, an electron from the 4s orbital is excited and rises to a 3d orbital, because this reduces the total energy

Cassidy Kohlenberger 3D
Posts: 51
Joined: Wed Sep 18, 2019 12:19 am

Re: Chromium and Copper

Postby Cassidy Kohlenberger 3D » Sun Oct 27, 2019 8:45 pm

They are exceptions because a completely full or a half full d sub-level is more stable than a partially full d sub-level. To make the d sub-level more stable, an electron from the 4s orbital is excited/rises to the 3s orbital. Instead of 3d^4 or 3d^9, we excite an orbital to make 3d^5 of 3d^10.

Lelija Kazlauskas 3J
Posts: 50
Joined: Thu Jul 11, 2019 12:16 am

Re: Chromium and Copper

Postby Lelija Kazlauskas 3J » Sun Oct 27, 2019 8:47 pm

Some atoms, like Chromium and Copper, are more stable when their shells or sub-shells are half-filled/filled with electrons, rather than almost half-filled/filled. These atoms are more stable this way, reaching an overall lower state of energy.

805097738
Posts: 180
Joined: Wed Sep 18, 2019 12:20 am

Re: Chromium and Copper

Postby 805097738 » Sun Oct 27, 2019 9:58 pm

because a fully filled or half filled set of orbitals is more stable so an electron is taken from the higher energy level to make the 3d level more stable

Marykate Abad 3L
Posts: 51
Joined: Wed Sep 18, 2019 12:19 am

Re: Chromium and Copper

Postby Marykate Abad 3L » Sun Oct 27, 2019 10:45 pm

Their electrons fill and half-fill two subshells, with some electrons in the higher energy level shells


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