Complete IIT AIEEE ICSE ISC PMT help forum
This is a free help Forum for Indian Students.
Complete IIT AIEEE ICSE ISC PMT help forum

Complete help forum for students preparing for icse iit aieee cbse pmt and other related exams.Stay updated about all 2011 exams.
 
HomeHome  PortalPortal  FAQFAQ  SearchSearch  RegisterRegister  MemberlistMemberlist  UsergroupsUsergroups  Log in  India NewsIndia News  
Keywords
YEAR 2010 RESULT CLASS
Latest topics
Top posters
abhas
 
Anu..i luv icse...:)
 
G-7
 
siya
 
Candy
 
jOhNy
 
Apurva
 
WinRrule
 
ambili
 
saif
 



Search if you can't find it here

Timeline of chemical elements discoveries

View previous topic View next topic Go down
AuthorMessage
rachel




PostSubject: Timeline of chemical elements discoveries Mon Oct 10, 2011 9:28 am

Timeline of chemical elements discoveries
The discovery of the elements known to exist today is presented here in chronological order. The elements are listed generally in the order in which each was first defined as the pure element, as the exact date of discovery of most elements cannot be accurately defined. Given is each element's name, atomic number, year of first report, name of the discoverer, and some notes related to the discovery.
Legend
Before 1800 (34 elements): discoveries during and before the age of enlightenment.
1800-1849 (+24 elements): science and industrial revolutions.
1850-1899 (+26 elements): the age of classifying elements received the impulse of the spectrum analysis. Boisbaudran, Bunsen, Crookes, Kirchhoff, and others "hunting emission line signatures".
1900-1949 (+13 elements): impulse with the old quantum theory and quantum mechanics.
1950-1999 (+16 elements): "post atomic bomb" issues for atomic numbers 98 and above (colliders, bombardment techniques).
2000-present (+5 elements): very recent discoveries.
Back to top Go down
View user profile

Timeline of chemical elements discoveries

View previous topic View next topic Back to top
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Complete IIT AIEEE ICSE ISC PMT help forum :: Chemistry :: Chemistry Question answer-