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Democritus thought that all matter are made of atomos (atoms) which could not be divided.
He claimed that matter was made of small, hard particles called atoms.It was he who inspired generations of scientists to conduct experiments that would clarify and refine our concept of the fundamental particles of matter.
He created the first atomic theory using a scientific method and he viewed atoms as tiny, solid balls.
All matter is made of atoms.
Atoms of the same element are identical and have the same mass
Atoms of different elements have different masses
Atoms could not be created or destroyed.
Atoms can not be changed into other atoms
Atoms combine together in Joseph John Thomson investigated cathode rays from 1884 to 1919.
Thomson discovered that the electrons that made up the cathode rays could be deflected by magnets or electrically charged plates.
He showed that the atom was made from even smaller things.
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