Science - Periodic table comprehension test

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Across
  1. 3. – A pure substance made of only one type of atom.
  2. 5. – A substance made of two or more elements chemically combined.
  3. 10. – Elements that are shiny, conductive, and usually solid at room temperature.
  4. 11. – Group 17 non-metals; highly reactive and form salts.
  5. 14. – The smallest unit of matter that retains the properties of an element.
  6. 16. – Atoms of the same element with different numbers of neutrons.
  7. 17. Electrons – Electrons in the outermost shell; they determine reactivity.
  8. 18. – A negatively charged particle that orbits the nucleus.
  9. 19. Table – A chart that organises all known elements by their properties.
  10. 20. – Elements with properties between metals and non-metals.
Down
  1. 1. Gases – Group 18 gases; very stable and unreactive.
  2. 2. – A horizontal row in the periodic table; properties change across the row.
  3. 4. – A positively charged particle found in the nucleus.
  4. 6. – Elements that are dull, brittle, or gaseous and poor at conducting heat.
  5. 7. – A neutral particle found in the nucleus of an atom.
  6. 8. Number – The total number of protons and neutrons in an atom.
  7. 9. Metals – Group 1 metals; very reactive and soft.
  8. 12. Number – The number of protons in an atom; it identifies the element.
  9. 13. – How easily an element reacts with other substances.
  10. 15. – A vertical column in the periodic table; elements share similar properties.