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Writing electron configuration

Posted: Fri Nov 01, 2019 10:52 am
by Ying Yan 1F
When reaching the d block, which is the correct way to the write the electron configuration, 3d 4s or 4s 3d? I've noticed it written both ways, and it made me kind of confused. Thank you!

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 11:07 am
by 005384106
When writing electron configuration you need to write it in numerical order. So the correct answer would be 3d 4s. :)

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 11:12 am
by ranqiao1e
The right way would be to write the 3D sub shell first

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 11:19 am
by Alexa Mugol 3I
3d comes before 4s because 4s is higher in energy than 3d. Therefore, you would remove 4s electrons before 3d electrons (if 4s came before 3d it would be harder to tell which is the valence).

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 12:04 pm
by ABombino_2J
Whenever you are writing an electron configuration the orbital with the lower n should come first.

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 12:13 pm
by PranaviKolla2B
For an element like calcium, would the electron configuration end in 4s^2? And what about for Ca^2+?

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 12:17 pm
by ABombino_2J
Yes, for Ca the electron configuration would en with 4s^2. For Ca^2+, the electron configuration would end with 3p^6.

Re: Writing electron configuration

Posted: Fri Nov 01, 2019 12:19 pm
by Eunice Nguyen 4I
PranaviKolla3G wrote:For an element like calcium, would the electron configuration end in 4s^2? And what about for Ca^2+?

Calcium would end on 4s2. For Ca^2+, because you are removing electrons, it'll become 3p6.