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12 Cards in this Set

  • Front
  • Back
said that all things contain matter and matter is made up of atoms and void, he also said that atoms are undivideable
Dalton Theory
he defined the atom having a uniformed density and being indivisible
Law of conservation of mass
matter/mass is neither created or destroyed by physical or chemical changes
Law of definite proportions
no matter the size of a sample, a chemical compound contains the same proportion % elements by mass
Law of Multiple Proportions
the same elements can combine in different rations to form different compounds
Avagardo's Number
the number of particles in one mole of a pure substance
Atomic Number
the # of protons in the nucleus for each atom of that element
Mass Number
total # of protons and neutrons
are atoms of the same element that have different masses
found out that electrons carrynegative electrical charges
discovered the neutron which he found to have no charge and wieghed roughly the same as the proton
Average Atomic Mass
is the weighted average of the atomic masses of the naturally occuring isotopes of an element