chemistry

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Across
  1. 2. An element is a substance that cannot be broken down into any other substance.
  2. 3. The larger number that tells us how many protons and neutrons there are in a nucleus of an atom.
  3. 7. A chemical that can show if a substance is acidic or alkaline by changing colour.
  4. 8. chemical reaction between an acid and a base, which forms water and a salt.
Down
  1. 1. a way of organising the elements which is used by scientists to group elements with similar properties.
  2. 3. A substance with particular chemical properties including turning litmus blue and neutralising acids.
  3. 4. The smaller number that tells us how many protons or electrons there are in an atom
  4. 5. An internationally recognised letter that stands for an element
  5. 6. elements in the same group (same vertical column) have similar chemical properties