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Description
Atoms, Elements and
Compounds
- Atoms
- Have a small central nucleus made up of protons and neutrons around the
electrons.
- The electrons are involved in chemical
reactions
- All substances are made up of atoms
- About 100 different types
- Form chemical bonds by loosing, gaining or sharing a small number of
electrons
- Represented by a chemical symbol
- When 2 or more atoms join together a molecule is formed
- Atoms in elements and compounds are held together by taking or sharing electrons
- Have a small central nucleus made up of protons and neutrons around the
electrons.
- Elements
- A substance which contains one type of atom
- Can have very different properties
- e.g silver, copper and gold are shiny solids
- e.g oxygen, nitrogen and chlorine are gasses
- e.g silver, copper and gold are shiny solids
- Are listed in the periodic table
- A substance which contains one type of atom
- Compounds
- Contain 2 or more elements bonded together
- e.g hydrogen and oxygen = water
- e.g hydrogen and oxygen = water
- Contain 2 or more elements bonded together
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