Two Special Elements in Periodic Table

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Madeline Musselman 3H
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Joined: Fri Sep 29, 2017 7:07 am

Two Special Elements in Periodic Table

Postby Madeline Musselman 3H » Sun Oct 29, 2017 8:33 am

What are the two elements in the periodic table that were unique in the d-block? Cr and __? and why were they different again?

Tatiana Hage 2E
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Re: Two Special Elements in Periodic Table

Postby Tatiana Hage 2E » Sun Oct 29, 2017 11:45 am

Cu is the other unique element. A completely full or half full d sub-level is more stable than a partially filled d sub-level, so an electron from the 4s orbital is excited and rises to a 3d orbital. Their electron configurations are - Cr: [Ar] 3d54s1 and Cu: [Ar]3d104s1

Amy Zheng 2l
Posts: 57
Joined: Fri Sep 29, 2017 7:04 am

Re: Two Special Elements in Periodic Table

Postby Amy Zheng 2l » Sun Oct 29, 2017 3:54 pm

cu, half shell vs full shell

Ozhen Atoyan 1F
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Re: Two Special Elements in Periodic Table

Postby Ozhen Atoyan 1F » Sun Oct 29, 2017 4:11 pm

The two elements that have exceptions are Cr and Cu, but those aren't the only ones. Some of the elements below them in the column may also have the same exception. Writing out the electron configuration will help.


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