Naked Science Forum

Non Life Sciences => Chemistry => Topic started by: The Scientist on 04/07/2010 13:42:36

Title: Why is it difficult to purify an inner-transitional metal?
Post by: The Scientist on 04/07/2010 13:42:36
Please provide detailed answers. Thanks!
Title: Why is it difficult to purify an inner-transitional metal?
Post by: The Scientist on 09/07/2010 15:48:59
Can anyone firstly explain about what is an inner-transitional metal? Thanks!
Title: Why is it difficult to purify an inner-transitional metal?
Post by: Bill.D.Katt. on 10/07/2010 20:13:55
Usually "inner transition metals" refers to lanthanides and actinides, these are the two removed periods that are usually placed below the table.
Title: Why is it difficult to purify an inner-transitional metal?
Post by: The Scientist on 11/07/2010 09:58:57
Quote from: Bill.D.Katt. on 10/07/2010 20:13:55
Usually "inner transition metals" refers to lanthanides and actinides, these are the two removed periods that are usually placed below the table.

But why do you think that those two periods are called inner transitional?
Title: Why is it difficult to purify an inner-transitional metal?
Post by: tommya300 on 11/07/2010 15:29:08
Quote from: The Scientist on 11/07/2010 09:58:57
Quote from: Bill.D.Katt. on 10/07/2010 20:13:55
Usually "inner transition metals" refers to lanthanides and actinides, these are the two removed periods that are usually placed below the table.

But why do you think that those two periods are called inner transitional?

"The f-block of the periodic table of the elements consists of those elements whose atoms or ions have valence electrons in f-orbitals. Actual electronic configurations may be slightly different from what is predicted by the aufbau principle. The elements are also known as inner transition elements. There are two series. Elements of the series in which the electrons are in 4f orbitals belong to the lanthanoid series. Elements of the series in which the electrons are in 5f orbitals belong to the actinoid series. There is a long-standing controversy as to whether La and Ac or Lu and Lr should belong to the f-block. IUPAC has now compromised by putting all 4 elements into the block, but this is contested, because there can only be 14 elements in f orbitals, so the block cannot be 15 elements wide."