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HELLO! Today, I will talk about atoms, its structure and history.
The basic building block of matter are atoms.
Atoms has three sub-atomic particles:Protons(positively charged particles),Electrons(negatively charged particles) and Neutrons(partcicles with no charge).
Atoms with equal protons and electons is a neutral charge. If there are more protons than electrons, it is a positive charge. If there are more electrons than protons, it is a negative charge.
John Dalton created the very first theory.(1808)
J.J. Thomson discovered electrons using the Cathode Ray Tube.(1897)
Democritus proposed that matter could not be divided into smaller pieces.
Ernest Rutherford discovered protons and the nucleus using the Gold Foil Experiment.(1911)
Neils Bohr improved Rutherford's model by proposing that electrons move around the nucleus in specific layers, or shells.(1913)
The Modern Model(1932-) Work done since 1920 has changed the model. The new atomic model has electrons moving around the nucleus in a cloud.
James Chadwick discovered neutrons while working with Rutherford.(1932)
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