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Atomic Theory, Photo-by-Otto-1240x775, rutherford-12860-portrait-medium -…

- - - - Law of Definite Proportions: Compounds are always composed in specific proportions.
        
        Electrons: Negatively charged particles
        
        Protons: Positively charged particles
        
        Understood that atoms contain an equal number of electrons and protons
        
        Later discovered that neon consisted of atoms with two different masses.
        
        Neutron: Neutral particle.
        
        Isotopes: Atoms of elements that are chemically alike, but differ in mass.
        
        Mass number: The sum of the protons and neutrons in the nucleus of the particular atom.
        
        Atomic number: Represents the number of protons in the nucleus of the atom.
- - - - (1782)
        
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        made measurements of chemical reactions in sealed containers.
        
        Antoine Lavoisier
- - - - Through observing Lavoisier and Proust’s work, Dalton derived the “atomic theory.”:
        
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        All matter is made of atoms
        
        Atoms are indestructible and cannot be divided into smaller particles
        
        All atoms of one element are exactly alike, but they are different from atoms of other elements.