Particles

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Across
  1. 5. The number of protons in an atom’s nucleus
  2. 9. A column in the periodic table
  3. 13. The arrangement of electrons in an atom
  4. 16. A tiny particle that makes up all matter
  5. 17. A positively charged particle in the nucleus of an atom
  6. 18. A type of element that is usually shiny and conducts electricity
  7. 19. A type of element that is usually dull and does not conduct electricity
  8. 20. A property that describes how a substance reacts with others
Down
  1. 1. The force between negatively charged electrons and the positively charged nucleus
  2. 2. The central part of an atom containing protons and neutrons
  3. 3. A negatively charged particle that orbits the nucleus
  4. 4. A property you can observe without changing the substance
  5. 6. The starting substances in a chemical reaction
  6. 7. A chart listing elements in order of atomic number
  7. 8. A substance made up of only one type of atom
  8. 10. A row in the periodic table
  9. 11. The new substance formed in a chemical reaction
  10. 12. A substance made of two or more different types of atoms joined together
  11. 14. A sign that a chemical reaction has taken place, e.g., colour change, gas, or temperature change
  12. 15. A particle in the nucleus with no electric charge