Chemistry unit 3 GCSE

Unit 3 revision

HideShow resource information

History of the periodic table

  • Early 1800's - atomic mass
  • Newlands law of octaves 
  • Demitri Mendeleev 
1 of 2

EARLY 1800'S 

  • There were two obvious ways of categorising elements: 1) Their physical and chemical properties 2) Their relative atomic mass
  • They had no idea of atomic structure, protons or electrons so there was no such thing as an atomic number. 
  • The only thing they could measure was the relative atomic mass and so known elements were arraned in order of the relative atomic mass. When this was done, a periodic pattern was noticed in the properties of the elements. 


  •  He noticed that every eighth element had similar properties, so listed the known elements in rows of 7.
  • The sets of eight were known as Newlands' octaves. 
  • It was because he left no gaps that his work was ignored. 
  • His work was criticised because: 1) his groups 

2 of 2


No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Chemical patterns and reactivity series resources »