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John Dalton. (1804) *Atoms Make Up All Matter. *Atoms Are Solid Like A Billiard Ball Or Bowling Ball. *Atoms Cannot Be Divided, Created, Or Destroyed.
J.J Thomson. (1904) He Described The Atom As A Ball Of Positive Charged With Electrons Embered In It.
Ernest Rutherford. (1909) *Discovered The Nucleus. *Theres A Positive Change In The Center. *Atoms Are Mostly Empty Space. *He Designed An Experiment To Use The Alpha Particles Emitted By A Radioactive Element As Probes To The Unseen World Of Atomic Structure.
Niel Bohr. (1913) Niels Bohr, proposed a model for the hydrogen atom that was consistent with Rutherford's model and yet also explained the spectrum of the hydrogen atom. The Bohr model was based on the following assumptions. The electron in a hydrogen atom travels around the nucleus in a circular orbit.
Quantum Model -Modern Model. (1926) Arthur Compton discovers the quantum (particle) nature of x rays, thus confirming photons as particles
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