Home » Articles « Back to article

p- block elements-II

sneha

Blazing goIITian

Posted on
26 Feb 2009 11:48:58 IST

Posts: 1243

26 Feb 2009 11:48:58 IST

Like 0 people liked this

394

p- block elements-II

Chemistry , Inorganic Chemistry

p - block Elements - II

GROUP 16(chalcogens)

ü O and S non metals, Se & Te metalloids, Po metal and radioactive

ü general valence shell configuration: ns² np⁴

ü O most abudant element on earth

ü O<< S < Se < Te < Po (size )

ü I.E.↓down the group

ü electronegativity↓down the group but S ≈ Se

ü electron affinity : O < Po< Te < Se < S (in magnitude )

ü O₂ gas, all others solids

ü M.P. and B.P. : O<< S < Se < Po< Te (large diff. between O & S due to their atomicity: O exists as O2 while S as S8)

ü All show allotropy

O : -2, -1/2, +1, +2 (+ve with F )

Po: +2, +4

All others : -2, +2, +4, +6 (more common are +4 & +6)

ü all form EH₂type compounds whose acidic character and reducing property↑down the group. stability ↓down the group

ü These form oxides of type EO₂ , EO₃ . both are acidic.

ü These form halides of type EX₂(except Se) , EX₄ & EX₆. some of these form dimeric monohalides. stability: F ^- > Cl ^-> Br ^- > I ^-

important compounds are ozone, hydrogen peroxide, sulphur dioxide, hydrogen sulphide, sulphuric acid, sulphurous acid and sodium thiosulphate.

trick to remember : O Style Se Te(ti)Po

Share this article on:

Comments (3)

sneha

Blazing goIITian

Joined: 17 Mar 2008 20:56:33 IST

Posts: 1243

26 Feb 2009 11:52:57 IST

Like 0 people liked this

comments welcome

tina

Blazing goIITian

Joined: 25 Oct 2008 09:56:56 IST

Posts: 302

1 Mar 2009 10:43:16 IST

Like 0 people liked this

good

DM Krishna

Cool goIITian

Joined: 8 Jun 2008 10:41:25 IST

Posts: 62

2 Mar 2009 22:31:03 IST

Like 0 people liked this

so nice of this...

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

Free Sign Up!

Comments (3)

Quick Reply

Reply

Preparing for IIT-JEE ?

Arihant Revision Package for IIT JEE - Books, Practice Tests + Rank Predictor

@ INR 1,995/-

For Quick Info