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Existed in 5ooB.C.
he used discourse
there are no limit to the amount of times a atom could be split -
100 B.C.
He did not think there was a limit to the number of times a substance could be divided.
He used discource. -
All change is caused by the collisions of atoms
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All matter is made up ofindivisual particles called atoms, which cannot be divided.
He measured the mass of elements -
Atoms are made of even smaller particles
He used a sealed glass tube a metal disk at each end and wire connecting the disks to a source of electricity. -
All of an atoms positive charge is centered in its nucleus. He did a gold foil experiment where he used a beam of alpha partilces and gold foil to delfect the beam.
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He suggests that an atom has a central sore called a nucleus. Electrons move in orbits like the rings of Saturn
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he discovered a eletron in an atom can go from one energy level to another when the atom gains or loses energy.
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Discovered that the elements atomic number is related to its X-Ray length.
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He suggests that moving particles like electrons have some properities of waves
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He used mathmatical Equations to describe the motion of particles. His work led to the electron cloud
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James confirms the existence of neutrons whitch have no charge. Atomic nucleui contain certain neutrons and positivly charged protons.
