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Democritus and early Greek philosophers
thought the material would must be made of tiny invisible particles called atomos meaning "indivisible or uncuttable"
Dalton's atomic theory-2
All atoms of a given element are identical to one another in mass and other properties, but the atoms of one element are different from the atoms of all other elements.
Dalton's atomic theory-3
The atoms of one element cannot be changed into atoms of a different element by chemical reactions; atoms are neither created nor destroyed in chemical reactions
Dalton's atomic theory-4
Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms
law of conservation of mass
The total mass of materials present after a chemical reaction is the same as the total mass present before the reaction.
law of multiple proportions
if two elements A and B combine to form more than one compound, the masses of B that can combine with a given mass of A are in the ratio of small whole numbers.
radiation produced from the negative electrode when high voltage was applied to partially excavated tubes
J. J. Thomson proposed that the atom was a uniform sphere with embedded electrons
1.602 x 10⁻¹⁹ C; all charges of subatomic particles are represented as multiples of this charge
nonmetallic elements or nonmetals
separated from metals by a diagonal step ladder in the periodic table
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