December 10, 2024, 05:44:26 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: How can you tell which subshells have higher or lower energies?  (Read 2221 times)

0 Members and 1 Guest are viewing this topic.

Offline unsavedhero

  • Regular Member
  • ***
  • Posts: 30
  • Mole Snacks: +1/-0
How can you tell which subshells have higher or lower energies?
« on: November 08, 2013, 04:48:27 PM »
 How is 4S lower energy than 3D. Makes no sense? I was trying to figure out the electron configuration for nickel and i got 1s2 2s2 2p6 3s2 3p6 3d10 and it all added up to 28 just like the atomic number of Ni. However apparently the actual configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3D8
I dont understand!!!!! Why would they skip 3D and go to 4s instead???? especially since 3D can hold a total of 10 electrons which would give us a total of 28 without the need for the 4th electron level. PLEASE HELP
Logged

Offline Corribus

  • Chemist
  • Sr. Member
  • *
  • Posts: 3551
  • Mole Snacks: +546/-23
  • Gender: Male
  • A lover of spectroscopy and chocolate.
Re: How can you tell which subshells have higher or lower energies?
« Reply #1 on: November 08, 2013, 04:53:16 PM »
The 4S orbital is often lower energy because it is less shielded from the nuclear core charge by inner shell electrons than the 3D orbital is, owing to its larger degree of penetration.
Logged
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline unsavedhero

  • Regular Member
  • ***
  • Posts: 30
  • Mole Snacks: +1/-0
Re: How can you tell which subshells have higher or lower energies?
« Reply #2 on: November 08, 2013, 05:11:59 PM »
..yeah.... anyway is there a way to tell which shells are of lower energy? is there some sort of pattern? I always thought that configurations would just follow the pattern of 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 lol. Like for example the 3d shell would be filled to it's maximum of 10 before proceeding to the 4s shell..
Logged

Offline Corribus

  • Chemist
  • Sr. Member
  • *
  • Posts: 3551
  • Mole Snacks: +546/-23
  • Gender: Male
  • A lover of spectroscopy and chocolate.
Re: How can you tell which subshells have higher or lower energies?
« Reply #3 on: November 08, 2013, 05:51:16 PM »
Logged
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 27884
  • Mole Snacks: +1815/-412
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: How can you tell which subshells have higher or lower energies?
« Reply #4 on: November 09, 2013, 03:29:55 AM »
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info
Pages: [1]   Go Up
« previous next »
Sponsored Links