Ground state electron configuration?

Moderators: Chem_Mod, Chem_Admin

Antonio Melgoza 2K
Posts: 33
Joined: Fri Sep 25, 2015 3:00 am

Ground state electron configuration?

Postby Antonio Melgoza 2K » Fri Oct 09, 2015 9:37 am

How do I find the electron configuration of an element?

Amy Pai
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: Ground state electron configuration?

Postby Amy Pai » Fri Oct 09, 2015 10:07 am

I'll demonstrate using an example: Vanadium (atomic #23)

Using the shorthand method, look for the noble gas with the closest number of electrons to Vanadium (without exceeding Vanadium's # of electrons), which is Argon. That gives you this: V: [Ar]

Then, can count the # of electrons still needed to write the correct configuration of Vanadium (23- 18= 5 electrons needed). Look at the periodic table and write the principle energy level (n), and the corresponding orbital (s, p, d, or f). Then write the number of electrons in that orbital. That gives you this: V: [Ar] 4s2

*The s, p, d, f sections of the periodic (2nd image): https://www.angelo.edu/faculty/kboudrea/general/quantum_numbers/Quantum_Numbers.htm

Keep going until you get to Vanadium: V: [Ar] 4s2 3d3

The number of electrons now match, but make sure to reorder the shells correctly by placing the d-orbital (3d3) in front of the 4s2, as Dr. Lavelle taught us: V: [Ar] 3d3 4s2

I hope this helps!


Return to “Electron Configurations for Multi-Electron Atoms”

Who is online

Users browsing this forum: No registered users and 1 guest