Year 8 Unit 2

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Across
  1. 2. – The number of protons in the nucleus of an atom (and also the number of electrons in a neutral atom).
  2. 5. – The very reactive metals in Group 1 of the periodic table (e.g. lithium, sodium, potassium).
  3. 6. – A column down the periodic table; elements in a group have similar properties.
  4. 8. – A way of showing the elements in a compound and how many atoms of each (e.g. H₂O).
  5. 10. – A particle in the nucleus of an atom with no charge (neutral).
  6. 12. – Two or more substances that are not chemically joined together and can be separated.
  7. 14. – A tiny particle with a negative charge that moves around the nucleus of an atom.
  8. 16. – A list of metals (and carbon/hydrogen) arranged in order of how reactive they are.
  9. 21. – A reaction where a more reactive element takes the place of a less reactive element in a compound.
  10. 22. – A substance made when two or more different elements are chemically joined together.
Down
  1. 1. – A chart that organises all the elements in order of their atomic number and properties.
  2. 3. – The reactive non-metals in Group 7 of the periodic table (e.g. chlorine, bromine, iodine).
  3. 4. – A particle in the nucleus of an atom with a positive charge.
  4. 7. – A row across the periodic table.
  5. 9. – How easily and quickly an element reacts with other substances.
  6. 11. – The unreactive gases in Group 0 of the periodic table (e.g. helium, neon, argon).
  7. 13. – A pure substance made of only one type of atom.
  8. 15. – The new substances made in a chemical reaction.
  9. 17. – The lightest element, with one proton and one electron; found in Group 1 of the periodic table.
  10. 18. – The total number of protons and neutrons in the nucleus of an atom.
  11. 19. – The substances you start with in a chemical reaction.
  12. 20. The smallest particle of an element that still has the properties of that element.