Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
The Development of the Periodic Table
Member rating: No Rating | Words: | Submitted: Thu Jan 13 2005
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
The Development of the Periodic Table In the early 19th century many chemists began to develop their knowledge of analytical chemistry, the classification of compounds, and it soon came necessary to classify the elements. Johan Döbereiner showed in 1817 that atomic weight of strontium lies approximately between that of calcium and barium and that these element showed a number of similar properties and thus should be grouped. He and other leading chemists later went on to show how this was also true for the halogens and the alkali metals. In 1863 John Newlands showed that when the elements were arranged in order of atomic weight every eighth element showed familiar traits and thus a table idea was brought up. He considered that some elements had not been invented so he left gaps to fit his idea however after about 20 elements the table became inaccurate. In 1869 Dimitri Mendeleyev did extensive research...
Get instant access
- Instant, unlimited access to our documents in full
- Swap your work for free access, or pay £4.99
- To see the full version of this document and 145,970 others
Receive email updates for this category
- Simply tell us your email address and receive a weekly Study Help Email for FREE
- Receive 3 FREE essay views with each email
- Get all the latest essays from Coursework.Info & discussion from TheStudentRoom.co.uk
