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ATOM - Coggle Diagram
ATOM
DEVELOPMENT
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THOMPSPNS' PLUM PUDDING MODEL. He was able to show, firstly the atoms contained very small negatively charged particles and later they also contained positive particles.
SHOT EX-PARTICLES THOUGH GOLD FOIL; SOME BOUNCED BACK. He showed that all the protons were concentrated in a tiny nucleus in the centre of the atom.
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FIRST TO DESCRIBE ATOMS IN A MODERN, SCIENTIFIC SENSE . Early models of the atom imagined hard indestructible spheres similar to Snooker balls colliding and bouncing off each other.
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BASIS FOR OUR MODERN ATOMIC MODEL. He forward the theory that electrons orbited in the shells rather like planets around sun.
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QUANTUM MECHANICS. Stated that electrons do not move in set paths around the nucleus, but in waves. It is impossible to know the exact location of the electrons; instead, we have clouds of probability, in which we are more likely to find an electron.
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CHADWICK, 1932 DISCOVERY OF THE NEUTRONS, while proving Rutherford's atomic theory, revolutionized the understanding of the atomic structure.
STRUCTURE
Centre of an atom constituting positively charged particles called protons and uncharged particles called neutrons.
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Discovered by James Chadwick by using scattered particle to calculate mass of the neutral particle. Its subatomic particle, symbol is n which has a neutral charge.
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Discovered by Rutherford. Contributes positive charge of the atom. It is a subatomic particle, symbol. p or p+. with a positive electric charge and a mass slightly less than that of a neutron.
Discovered by J.J Thompson. Revolve around centre of nucleus. Its subatomic particle, symbol e, whose electric charge is negative one elementary charge.
MODELS
ATOM IS TINY, HARD, AND UNCUTTABEL.
The shape of atoms explains behaviors of elements.
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SOLID, INDIVISISIBLE SPHERE COULD NOT DESTROY
OR DESTRUCT.
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DIVISIBLE UNITS COMPOSED OF POSITVE CHARGES CONCENTRATED IN THE NUCLEUS WITH NEGATIVE CHARGES ROBITING AROUND THE NUCLUES
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ATOM IS A SPHERE OF POSITVE CHARGE CONTAINING A FEW NEGATIVELY CHARGED PARTICLES, CALLED ELECTRONS.
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A PROBABILITY TO FIND ELECTRONS WITHIN A SPACE SORROUNDING THE NUCLEUS. THE CLOUD IS DENSER WHERE THE PROBABILITY OF FINDING ELECTRON IS HIGH.
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