Atoms and the Periodic Table

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Across
  1. 4. Has a trunk
  2. 9. A substance made of one type of atom only.
  3. 10. Subatomic particle with a positive charge and a relative mass of 1. The relative charge of a proton is +1.
  4. 11. A substance formed by the chemical union of two or more elements.
  5. 13. The smallest part of an element that can exist
  6. 16. The characteristics of something. In chemistry, chemical properties include the reactions a substance can take part in. Physical properties include colour and boiling point.
  7. 17. Large marsupial
  8. 18. Electrically charged particle, formed when an atom or molecule gains or loses electrons.
Down
  1. 1. The central part of an atom. It contains protons and neutrons, and has most of the mass of the atom. The plural of nucleus is nuclei.
  2. 2. Likes to chase mice
  3. 3. Flying mammal
  4. 5. Subatomic particle, with a negative charge and a negligible mass relative to protons and neutrons.
  5. 6. Element that is a poor conductor of electricity and heat, and which forms acidic oxides.
  6. 7. table: A tabular representation of all known elements in order based on atomic number, eg all the noble gases are found on the right of the periodic table.
  7. 8. A vertical column in the periodic table containing elements with similar chemical properties.
  8. 12. A horizontal row in the periodic table.
  9. 14. Shiny element that is a good conductor of electricity and heat, and which forms basic oxides.
  10. 15. Man's best friend