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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: lax400 on September 27, 2011, 11:06:56 PM

Title: Bromium Electron Configuration
Post by: lax400 on September 27, 2011, 11:06:56 PM

Bromium has 35 electrons, so shouldn't the electron configuration be:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

Why is it

1s2 2s2 2p6 3s2 3p5 4s2 4p5?

Title: Re: Bromium Electron Configuration
Post by: Wald_ron on September 28, 2011, 11:15:09 AM

Quote from: lax400 on September 27, 2011, 11:06:56 PM

Bromium has 35 electrons, so shouldn't the electron configuration be:

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

Why is it

1s2 2s2 2p6 3s2 3p5 4s2 4p5?

The bromine ground state electron configuration is
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵