Home » Ask & Discuss » Chemistry. » Physical Chemistry « Back to Discussion

Physical Chemistry

New kid on the Block

Joined:	22 Feb 2007
Post:	2

22 Feb 2007 21:55:27 IST

0 People liked this

401

Electronic Configuration

None

Lanthanide(La){57} has an irregularity in filling up of the orbitals. 5-d is filled by an electron therefore violating the Aufbau Principle.Why?

The same case is applicable for actinide as well.

According to Aufbau Principle, 4-f should be filled first. and then 5-d. But it is not happening.

Share this article on:

Comments (2)

goutham harsha (1nkZ)

Blazing goIITian

Joined: 7 Feb 2007

Posts: 544

23 Feb 2007 03:38:51 IST

Like 0 people liked this

Thats bcos of the screening effect produced by the inner electrons.

Bipin Dubey

Forum Expert

Joined: 23 Jan 2007

Posts: 7942

25 Feb 2007 18:05:12 IST

Like 0 people liked this

Due to screening effect the inner electrons shield the outer electrons and the attractive force of the nucleus is somewhat decreased.Thus 5d orbital is filled first instead of 4f orbital thus violating Aufbau Principle.

Best Wishes

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team