2.43 6th edition

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Alma Carrera 3C
Posts: 33
Joined: Fri Apr 06, 2018 11:02 am

2.43 6th edition

Postby Alma Carrera 3C » Fri Oct 26, 2018 9:52 pm

For Tungsten, the electron configuration is written as [Xe] 4f14 5d4 6s2. I thought 6s is always written before 5d unless 5d is full, which in this case it's not. Can someone please explain this to me?

Shubham Rai 2C
Posts: 64
Joined: Fri Sep 28, 2018 12:27 am

Re: 2.43 6th edition

Postby Shubham Rai 2C » Fri Oct 26, 2018 9:57 pm

You are supposed to always write the lowest energy levels based on their n number. Initially, it is easier to fill the 6s orbital but when the electrons begin to fill the 5d orbital, the overall energy of the 5d orbital is lower than the 6s orbital. Thus, we have to write the configuration from the lowest energy level to the highest energy level. In this case, 5d before 6s.

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