Atoms and elements
- Created by: Poppy Gregson
- Created on: 28-02-16 13:26
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- Atoms and elements
- Atoms make up everything and you can only see them through an incredibly powerful microscope
- Atom have a small nucleus surrounded by electrons
- Electrons
- They move around the nucleus
- They are negatively charged
- They are tiny but they cover a lot of space
- They occupy shells around the nucleu
- Nucleus
- Its in the middle of the atom
- It contains protons and neutrons
- Protons are positively charged
- Neutrons have no charge
- The nucleus a positive charge
- Electrons
- Number of protons equals number of elecrons
- Atoms have no charge overall. They are neutral
- The number of protons always equals the number of electrons in a atom
- If some electrons are added or removed the atom becomes charged and is then an ion
- Elements consist of one type of atom only
- Its the number of protons in the nucleus that decides what type of atom it is
- An atom with one proton in its nucleus is hydrogen and an atom with two protons is helium
- If a substance only contains one type of atom its called an element
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