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All metals were formed from 2 principles. Mercury and Sulfur -
Atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped. -
Solid forms of matter are composed of indivisible elements shaped like triangles -
Defined that matter was composed of atoms that were not created or destroyed during chemical reactions. -
Equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties. -
Elements arranged according to the value of their atomic weights present a clear periodicity of properties -
All atoms contain tiny negatively charged subatomic particles or electrons. -
She suggested that the powerful rays, or energy, the polonium and radium gave off were actually particles from tiny atoms that were disintegrating inside the elements. -
Any liquid is made up of molecules -
Millikan's work demonstrated that electrons did have a discrete, quantifiable charge -
Described the atom as having a tiny, dense, and positively charged core called the nucleus -
Some physical quantities only take discrete values -
Atomic numbers are the fundamental feature that describes an element. -
Discovery of the neutron.