YR 9 CHEMISTRY CROSSWORD

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Across
  1. 2. an atom that has more electrons than protons
  2. 3. the mass of an atom; equals the number of protons plus the number of neutrons
  3. 4. the centre of an atom-contains protons and neutrons
  4. 6. the area around the nucleus where the electrons travel
  5. 11. describes the electrons moving around in each shell
  6. 13. total number of protons in an atom;defines what atom it is
  7. 15. a substance that contains only two or more type of atom
  8. 16. positively charged particles in the nucleus of an atom
  9. 17. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
  10. 18. theory that all matter is is made up of atoms
  11. 20. vertical column on the periodic table
  12. 21. a substance that only contains one type of atom
Down
  1. 1. parts that make up an atom
  2. 4. neutral particles found in the nucleus of an atom
  3. 5. negatively charged particles found orbiting the nucleus of an atom
  4. 7. an ion, or charged particle that has more protons than electrons.
  5. 8. a table that lists all the elements in order of their atomic number
  6. 9. smallest part of matter. contains protons, neutrons and electrons
  7. 10. horizontal row on the periodic table
  8. 12. A form of a chemical element in which the atoms have the same number of protons but with a different number of neutrons
  9. 14. an obsolete model of the atom, presented by Niels Bohr in 1913.
  10. 19. different energy levels where electrons orbit the nucleus