MATTER

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MATTER

• 3. Elements and compounds.

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Pure substances

• A pure substance has always the same composition
  and the same characteristics (density, colour,
  taste, smell, boiling point, etc)

- They can be descomposed into simplier
substances using chemical methods.
- They cant be descomposed.
- There are 109 elements.
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Living matter elements
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Elements and Atoms

• An element is a substance that cannot be broken
  down into other substances by ordinary chemical
  reactions.For example oxygen (O), sodium (Na),
  carbon (C)
• An atom is the smallest piece of matter that
  still retains the property of an element.

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Protons Neutrons Electrons Element
name

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Atoms (of the same type or of different type) can
come together to form molecules or largier
grouping of atoms.
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