Topic 1- Atomic structure and the periodic table

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Across
  1. 1. ​A substance made up of two or more types of atoms chemically combined together.
  2. 3. The columns of the periodic table represent different groups of elements. Elements with similar properties are in the same group.
  3. 4. table ​Table of elements arranged in order of atomic number and such that elements with similar properties are in the same column (group).
  4. 6. ​A chemical reaction in which a more reactive element displaces a less reactive element from its compound.
  5. 8. ​The number of protons in the nucleus.
  6. 11. model stated that the mass was concentrated at the centre of the atom and that the nucleus was charged.
  7. 12. ​consists of two or more elements or compounds not chemically combined together.
  8. 14. the components between two phases.
  9. 17. periodic table.
  10. 20. ​The smallest part of an element that can exist. All substances are made up of atoms.
  11. 21. ​A separation technique used to separate a mixture of chemicals by
  12. 22. pudding model ​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.
  13. 24. ​An atom or molecule with an electric charge due to the loss or gain of electrons.
  14. 26. ​The elements in Group 1 of the periodic table.
  15. 27. Elements that react to form negative ions. Found towards the right and top of the periodic table.
  16. 29. number ​The total number of protons and neutrons in the nucleus.
  17. 30. metals: ​The collection of metallic elements in the middle of the periodic table.
  18. 31. ​A separation technique used to separate solids from liquids.
Down
  1. 2. Positively charged subatomic particle present in the nucleus of the atom. Relative mass of 1.
  2. 5. atomic mass ​An average value that takes account of the abundance of the isotopes of the element.
  3. 7. ​A separation technique used to produce solid crystals from a solution by evaporating the solvent.
  4. 9. ​A method of separating a mixture of substances according to their different boiling points.
  5. 10. ​Different energy levels in atoms occupied by electrons.
  6. 13. ​Neutral subatomic particle present in the nucleus of the atom. Relative mass of 1. Noble gases: ​The elements in Group 0 of the periodic table.
  7. 15. Atoms of the same element with the same number of protons but a different number of neutrons.
  8. 16. ​The elements in Group 7 of the periodic table.
  9. 18. Negatively charged subatomic particle which orbit the nucleus at various energy levels. Very small relative mass (negligible).
  10. 19. ​A substance made up of only one type of atom.
  11. 23. Elements that react to form positive ions. Found to the left and towards the bottom of
  12. 25. ​Positively charged object composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it.
  13. 28. distillation ​A procedure by which two liquids with different boiling points can be separated.