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Classification of element
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Atom
The smallest particle of an element
Three subatomic particles
Proton, neutrons and electrons
Electron
Particle with negative charge
Proton
Particle with positive charge
Neutron
Neutral particle with no charge
Nucleus
Contain protons and neutron
The number of electrons in an atom
Equal to the number of protons
Charge of atom
Neutral
Molecules
Made up of two or more atoms
Element
The simplest form of substance
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