Topic 1 – Atomic Structure and the Periodic Table

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