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What is Matter?
Anything with mass or takes up space
What is an Atom?
Smallest particle of matter that can exist by itself
Explain the term Molecule.
Group of atoms chemically joined
What are Ions?
Atom or group of atoms with a charge
State the Law of Conservation of Matter.
In chemical reaction, matter is neither created or destroyed
List the subatomic particles and their properties.
Protons, +1, Mass 1, Nucleus. Neutron, 0, Mass 1, Nucleus. Electron, -1, Mass 0, Orbiting Nucleus
What did Dalton discover?
Atomic Theory
What did Crookes discover?
Cathode Rays
What did Helmholtz discover?
Electricity made of particles
What did Thompson discover?
Electrons, Plum pudding model, Mass: charge ratio
What did Millikan discover?
Mass of e-, oil drop experiment
Mosley
Atomic Number, Number of protons
What did Bohr discover?
Energy levels, quantised
What did Rutherford discover?
Nucleus, Protons
What did Chadwick discover?
Neutrons
Explain Rutherford’s discovery of the nuclear atom.
Most pass through, so mainly empty space. Alpha particles, positive. Some deflected so positive centre. Some reflected( or bounced back ) so centre very dense.
Note 
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