Tuesday, 15 March 2016

1.5 Understand the terms atom and molecule

Atoms

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

This is a model of an atom (known as the 'nuclear model')...


Molecule

Molecules are two or more atoms bonded together

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