Atomic structure & the periodic table

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Across
  1. 2. the process whereby small amounts of dissolved substances are separated by running a solvent
  2. 3. an area in an atom, around its nucleus, where electrons orbit
  3. 7. atoms that have the same number of protons but different number of neutrons i.e. they have the same atomic number but a different mass number
  4. 9. a material such as absorbent paper
  5. 12. solution the mixture made by adding a soluble substance to water
  6. 13. a charged particle produced by the loss or gain of electrons
  7. 14. a tiny positive particle found inside the nucleus of an atom
  8. 15. table an arrangement of elements in the order of their atomic numbers, forming groups and periods
  9. 17. equation n equation that helps you see how much of each substance is involved in a chemical reaction by showing the chemical symbols and formulae of all the reactants and products involved
  10. 18. a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance
  11. 19. number the number of protons in an atom. It is sometimes called the proton number
  12. 20. a dense particle found in the nucleus of an atom. It is electrically neutral (no charge)
  13. 23. a substance made when two or more elements are chemically bonded together
  14. 26. of mass of law the total mass of the products formed in a reaction is equal to the total mass of the reactants
Down
  1. 1. the very small and dense central part of an atom that contains protons and neutrons
  2. 4. the smallest part of an element that can still be recognised as that element
  3. 5. number the number of protons plus neutrons in the nucleus of an atom
  4. 6. symbol equation an equation using symbols and in which there are equal numbers of each type of atom on either side of the equation
  5. 8. structure a set of numbers to show the arrangement of electrons in their shells (or energy levels)
  6. 10. all the elements in the columns (labelled 1 to 7 and 0) in the periodic table
  7. 11. equation a way of describing what happens in a chemical reaction by showing the names of all reactants and the products they form
  8. 16. a tiny particle with a negative charge. Electrons orbit the nucleus of atoms or ions in shells
  9. 17. symbols the abbreviations used in balanced symbol equations to show if reactants and products are solid (s), liquid (l), gas (g)or dissolved in water (aq)
  10. 21. gases the very unreactive gases found in Group 0 of the periodic table. Their atoms have very stable electronic structures
  11. 22. a substance we start with before a chemical reaction takes place
  12. 24. a substance made as a result of a chemical reaction
  13. 25. fuel made from animal or plant products