-
500 BCE
The Alchemists
the alchemist contributed to the atom by showingall metals are composed of mercury and sulfer and these are able to be transfered into gold. -
460 BCE
Democritus
showed how atoms combine and hold together in so called "clusters" which showed they can be compressed -
400 BCE
aristotle
made the four elements and didnt beleive in the atom theory. he believed that the four elements were the only concept. -
350 BCE
Plato
found that there were five regular solids. these solids are earth, air, fire, water, and quintessence. -
Robert boyle
he showed that fixed gases can be compressed because the particles are so spread apart. he was the first modern chemist. -
lavoisier
showed how to seperate molecules from atoms. -
solar system model
benjamin martin made this to show the motions of the planets -
john dalton
he studied color blindness and how the atom controls it -
dmitri mendeleev
created the first elements of the periodic table -
plum pudding model
electrons sourouded by positive charges or called thompsons plum pudding model -
jj thomson
discovered the negative charged electrons in an atom -
henry g. j. mosely
created the chemical concept of an an atomic number -
the curies
she found that atoms don't make things radioactive they are radioactive themselves -
albert einstein
albert created the existince of atoms -
robert milikan
did the oil drop experiment. this experiment showed the exact charge of an electron. he did this by putting forced electrons with changes in the motion of oil. -
Neils bohr
he showed that a liquid drop provides a good representation of the atoms nucleus. -
electron cloud model
werner heisenberg created this model of an atom. it shows the nucleus in a charged cloud. -
Ernest Rutherford
nucleus had a central positive energy and backed it up with a experiment. -
Werner Heisenberg
no atom or anything as such has a definite shape -
billard ball model
john dalton created the billard ball model which is the smallest particles made up
