the general features of t ransition metal chemistry l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
THE GENERAL FEATURES OF T RANSITION METAL CHEMISTRY PowerPoint Presentation
Download Presentation
THE GENERAL FEATURES OF T RANSITION METAL CHEMISTRY

Loading in 2 Seconds...

play fullscreen
1 / 36

THE GENERAL FEATURES OF T RANSITION METAL CHEMISTRY - PowerPoint PPT Presentation


  • 163 Views
  • Uploaded on

THE GENERAL FEATURES OF T RANSITION METAL CHEMISTRY. G eneral features of transition metal s. This presentation explains what a transitio n metal is in terms of its electronic structure, and then goes on to look at the general features of transition metal chemistry. These include

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'THE GENERAL FEATURES OF T RANSITION METAL CHEMISTRY' - lysa


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
g eneral features of transition metal s
General features of transition metals

This presentation explains what a transition metal is in terms of its electronic structure, and then goes on to look at the general features of transition metal chemistry.

These include

  • variable oxidation state (oxidation number)
  • complex ion formation
  • coloured ions
  • catalytic activity
what is a transition metal
What is a transition metal?
  • The terms transition metal (or element) and d block element are sometimes used as if they mean the same thing.
  • They don't - there's a subtle difference between the two terms.
d block elements
d block elements
  • You will remember that when you are building the Periodic Table and working out where to put the electrons, something odd happens after argon.
  • At argon, the 3s and 3p levels are full, but rather than fill up the 3d levels next, the 4s level fills instead to give potassium and then calcium.
  • Only after that do the 3d levels fill.
d block elements6
d block elements

The elements in the Periodic Table which correspond to the d sublevels filling are called d block elements. The first row of these is shown in the shortened form of the Periodic Table below.

transition metals
Transition metals
  • Not all d block elements count as transition metals! There are discrepancies between the various syllabuses, but the majority use the definition:
  • A transition metal is one which forms one or more stable ions which have incompletely filled d orbitals.
forming t ransition metal ions
Forming transition metal ions

The rule is quite simple. Take the 4s electrons off first, and then as many 3d electrons as necessary to produce the correct positive charge.

slide28

Only one lone pair is shown on each water molecule. The other lone pair is pointing away from the aluminium and so isn't involved in the bonding. The resulting ion looks like this:

Dotted arrows represent lone pairs coming from water molecules behind the plane of the screen or paper. Wedge shaped arrows represent bonds from water molecules in front of the plane of the screen or paper.

slide32

Once the co-ordinate bonds have been formed, the ion looks exactly the same as the equivalent aluminium ion.

Because the iron is forming 6 bonds, the co-ordination number of the iron is 6.

slide34

Only one of the 4 lone pairs on each chloride ion is shown. The other three are pointing away from the copper ion, and aren't involved in the bonding.