All substances are made up of atoms, they are the smallest thing that can exist. They contain...
- A nucleus (made up of protons and neutrons)
- Electrons
Nucleus...
- situated in the middle of an atom
- It contains protons and neutrons
- It has a positive charge (because of the protons)
The electrons...
- They move around the nucleus in energy levels called shells
- They are negatively charged
Masses and charges...
- Protons have a relative mass of 1 and a relative change of +1
- Neutrons have a relative mass of 1 and a relative charge of 0
- Electrons have a relative charge of 1/1800 and a relative charge of -1
Molecule
Molecules are two or more atoms bonded together
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