Atoms, elements and compounds

Atoms, elements and compounds

1. Mixtures can be separated into simpler substances with fewer parts.

2. A compounds can be broken down into simpler compounds or its elements.

3. Elements are substances that cannot be broken down by chemical reactions into simpler substances.

4. Inside the atom

   • Sub-atomic particles have both a charge and a mass. You can work out the mass of an atom by adding together the numbers of protons and neutrons.
   • Since an atom had equal numbers of protons and electrons, the charges cancel out.
   • Neutrons have no charge and are neutral.
   • The sum of the number of protons and neutrons in an atom is its mass number.
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