Chemistry Wilson class

By Brad316
  • Period: 370 to 400


    -Lived from 400 BC to 370 BC
    -A Greek philophoser that proposed that matter was made up of small, hard, indivisble, particles, which he called atoms
    - Had no evidence to support his theory
    -Then modern atomic theory began in the late 1700s
  • Period: to

    John Dalton

    -Matter is composed of tiny indivisible particles called atoms.
    -All atoms of the one element are identical but are not to other elements.
    -Was born in cumbria but later died in manchester.
  • Period: to

    Joseph J. Thomson

    -Plum pudding model of the divisible atom
    -atoms consist of uniform positve charge with also negatively charged particls.
    -positive charge of sphere = the negatively charged
    -Born in manchester but then died in cambridge
  • Period: to

    Robert Milikan

    -Born in morrison, illinios, then died in san marino california.
    -Measured charges of electrons using a perfume bottle while there was water inside of it.
  • Period: to

    Enest Rutherford

    -Born in Brightwater, New Zealand. Then died in cambridge
    -Proposed the model of the atom. Contains
    -positively charged protons
    -number of protons equal the number of electrons
  • Period: to

    Niels Bohr

    -Proposed planetary model for the hydrogen atom
    -electrons move around the nucleus in a fixed orbit
    -An electron can absorb energy and move to a higher energy orbit.
    -Born in copenhagen, then died in denmark
  • Period: to

    James Chadwick

    • The nucleus of an atom contains neutrons, electrically neutral particles with a mass similiar of the protons it has. -Born and grew up in Bollington, united kingdom, then died in cambridge