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Atomic Structure.

elements are the simplest substances.

100 different elements.

each element is made up of very tin y particles called atoms.

each element is made up of a particular atom, but it will be different to the type of atom any other element contains.

an atom is very small ( 0.00000001 cm wide).

the particles atoms are made up of are -protons -neutrons -electrons

Structure of the atom.

All (protons, neutrons and electrons) are not evenly spread out in an atom.

the protons and neutrons exist in a dense space at the centre of the atom - (nucleus)

the electrons are spread out around the atom, they orbit the nucleus in layers - (shells)

Mass and Electron charge.

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