chemistry

  • Democritus
    100

    Democritus

    -came up with the idea that matter is composed of empty space through which atoms move.
    -atoms are solid, homogeneous have different sizes and shapes
    -different kinds of atoms have different sizes and shapes
    410 BC
  • aristotle
    100

    aristotle

    • one of the most influential philosophers. -wrote extensively on many subjects including politics, ethics, nature, physics, and astronomy.
    • most of his writings have been lost through the ages
  • Joseph Proust

    Joseph Proust

    Known for creating elements of water. also worked on weight of elements
  • antione lavosier

    antione lavosier

    compiled a list of elements known at hte time. The list contained 23 elements. Many of these elements such as silver, gold, carbon, and oxygen, were known since prehistoric times.
  • William Crookes

    William Crookes

    noticed flashed that produced some form of radiation striking a light-producing coating that had been applied to the end of the tube.
  • Dalton

    -all matter is composed of extremely small particles called atoms
    -all atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element are different from those of any other element.
  • Amadeo Avagadro

    Amadeo Avagadro

    was known for mocleur theroy. Also worked on the weight of mass voulmes of gases.
  • invention of telephone

    invention of telephone

    was created by alexander grahm bell. The first coversation was Come in here I want to see you. people could now talk to each other over the phone
  • Invention of automobile

    Invention of automobile

    Was a vehicle that could be driven and was on four wheels
  • Madame Curie

    Madame Curie

    She did pinoneer research for radioactivity she also discovered two elements and also won a nobal peace prize
  • Henri Becquerel

    Henri Becquerel

    He was the one who discovered radioactivty and he won 3 nobal peace prize.
  • J.J Thomsonn

    J.J Thomsonn

    He began a series of cathode ray tube experiments in the late 1890's to determine the ration of its charge to its mass. He then determined the charge to mass ration of the charged particle.
  • max planck

    max planck

    began searching for an explanation as he studied the light emitted from heated objects.
  • Robert Millikan

    Robert Millikan

    He determined the charge of an electron
  • Ernest Rutherfed

    Ernest Rutherfed

    Rutherfed worked on alph atoms and how they could be deflected throught objects.
  • Henry mosaley

    Henry mosaley

    Discovered that atoms of each element contain a unique positive charge in their nulei.
  • niels bohr

    niels bohr

    proposed that hydrogen atom has only certain allowabel energy states. The lowest alowable evergy state of an atom is called its ground state. when an atom gains evergy it is said to be in an excited state.
  • werner heisenberg

    werner heisenberg

    concluded that it is impossible to make any measurement on an object without disturbing the object.
  • louis debroglie

    louis debroglie

    propoesd idea that eventually accounted for the fixed energy levels of bohr's model.
  • Erwin Schrodinger

    Erwin Schrodinger

    furthered the wave-particle theory proposed by debroglie. He derived an equation that treated the hydrogen atom's electron as a wave.
  • Albert Einstein

    Albert Einstein

    Developed theroy of realtivity which is one of the two pillars of modern science.
  • James chadwhick

    James chadwhick

    showed that the nucleus also contained another subatomic partilce a neutral partilce call the neutron.
  • World war II

    World war II

    Was a war that was fought between Germany, Japan, France, America
  • Vietnam

    Vietnam

    was a war fought between America and Vietnam over a long period of time before America pulled out of the war