Atomic Structure and the Periodic Table

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Across
  1. 1. Two or more elements or compounds not chemically combined together.
  2. 3. A separation technique used to produce solid crystals from a solution by evaporating the solvent.
  3. 6. A separation technique used to separate solids from liquids.
  4. 7. An atom or molecule with an electric charge due to the loss or gain of electrons.
  5. 8. Positively charged object composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it.
  6. 11. The elements in Group 1 of the periodic table (6,6).
  7. 12. Negatively charged subatomic particle which orbit the nucleus at various energy levels.
  8. 14. Positively charged subatomic particle present in the nucleus of the atom.
  9. 15. Elements that react to form negative ions. Found towards the right and top of the periodic table.
  10. 19. The smallest part of an element that can exist.
  11. 20. Atoms of the same element with the same number of protons but a different number of neutrons.
  12. 21. The total number of protons and neutrons in the nucleus (4,6).
  13. 22. The collection of metallic elements in the middle of the periodic table (10,6).
  14. 25. A method of separating a mixture of substances according to their different boiling points (10,12).
  15. 26. A chemical reaction in which a more reactive element displaces a less reactive element from its compound.
Down
  1. 2. An average value that takes account of the abundance of the isotopes of the element (8,6,4).
  2. 4. The columns of the periodic table.
  3. 5. The number of protons in the nucleus (6,6).
  4. 9. The elements in Group 7 of the periodic table.
  5. 10. A substance made up of only one type of atom.
  6. 13. The elements in Group 0 of the periodic table (5,5).
  7. 16. A separation technique used to separate a mixture of chemicals by distributing the components between two phases.
  8. 17. A substance made up of two or more types of atoms chemically combined together.
  9. 18. Atomic model devised after the discovery of the electron. The model suggests the atom is a ball of positive charge with negative electrons scattered through it (4,7).
  10. 23. Neutral subatomic particle present in the nucleus of the atom. Relative mass of 1.
  11. 24. Elements that react to form positive ions. Found to the left and towards the bottom of the periodic table.