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Atom - Coggle Diagram
Atom
MODEL
Democritus
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All matter could be divided into smaller and smaller pieces
until a single invisible particle was reached (atom)
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DALTON
since the atoms of an element have identical properties such as mass and combine in constant ratios, every compound must have a fixed, definite composition.(Law of constant composition)
in chemical reactions, atoms join together or separate from
each other but are not destroyed
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THOMSON
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discovered that particles moving in the opposite direction to cathode rays deflect away from positive fields toward negative fields.
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RUTHERFORD
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atoms must contain a positively charged core(nucleus)
surrounded by empty spaces containing electrons
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CHADWICK
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an atom is composed of a nucleus, containing protons and
neutrons, number of electrons = to the number of protons
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Development
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MATTER
Classifying Matter
Pure substances are either elements or compounds.
Elements can't be broken down by chemicals andcompounds are made by the formation of two or more
elements
Mixtures can be heterogeneous or homogeneous mixtures
look the same throughout, and the suspension is a mixture in
which tiny particles of a substance are held in.
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What is Matter?
3 states: solid, liquid, gas
Matter can changed between the 3 states: solid to liquid
(melting), liquid to gass ( evaporation), gas to
liquid(condensation), liquid to solid (freezing), solid to gas
(sublimation), and gas to solid (deposition)
The particle theory of matter: matter is composed of tiny objects
called particles, particles have space between them, particles are always in motion, and particles in a substance attract
each other.
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