What are all the exceptions to electron configurations for writing in shorthand?

asked by @gracel85 • 6 months ago • Chemistry • 5 pts
Add comment
4 answers

1) Chromium

Should be : (Ar) 3d^4 4s^2

It is : (Ar) 3d^5 4s^1

2) Copper

Should be : 3d^9 4s^2

It is : 3d^10 4s^1

There are more but I am sure you are not responsible to know them all at college level.

answered by @nikaa18 • 6 months ago
  • Is this because the orbitals would rather be half filled than empty to be more stable? Grace commented 6 months ago
  • Yes Grace. That's the main reason. Good guess! Nika commented 6 months ago

Expected Cr = [Ar]4s23d4 Cu = [Ar]4s23d9 Mo = [Kr]5s24d4 Ru = [Kr]5s24d6 Pd = [Kr]5s24d8

Found experimentally Cr = [Ar]4s13d5 Cu = [Ar]4s13d10 Mo = [Kr]5s14d5 Ru = [Kr]5s14d7 Pd = [Kr]5s04d10

answered by @marinas13 • 6 months ago

Expected Cr = [Ar]4s23d4 Cu = [Ar]4s23d9 Mo = [Kr]5s24d4 Ru = [Kr]5s24d6 Pd = [Kr]5s24d8

Found experimentally Cr = [Ar]4s13d5 Cu = [Ar]4s13d10 Mo = [Kr]5s14d5 Ru = [Kr]5s14d7 Pd = [Kr]5s04d10

answered by @richarda20 • 3 months ago

Expected Cr = [Ar]4s23d4 Cu = [Ar]4s23d9 Mo = [Kr]5s24d4 Ru = [Kr]5s24d6 Pd = [Kr]5s24d8

Found experimentally Cr = [Ar]4s13d5 Cu = [Ar]4s13d10 Mo = [Kr]5s14d5 Ru = [Kr]5s14d7 Pd = [Kr]5s04d10

answered by @richarda20 • 3 months ago