history

• what are the common information of pte?

  1. element name
  2. chemical symbol
  3. atomic number
  4. atomic mass
• johann dobreiner

  • triad of elements
  • he groups elements together
• john newlands

  • law of octaves
  • arranged the elements in increasing mass
• dmitri mendeleev

  • measured atomic weight of elements and used those weights to describe chemical properties of elements
• lothar meyer

  • calculated atomic weights and used those calculations to describe physical properties of elements
• henry moseley

  • law of periods
  • describes that each element's property is based on its atomic number