Atomic Structure Topic Key Words

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Across
  1. 5. The rows that make up the periodic table.
  2. 6. equation A way of describing what happens in a chemical reaction by showing the chemical formulae of reactants and products. Must be balanced.
  3. 7. solutions The mixture made by adding a soluble substance to water.
  4. 9. Substance(s) made as a result of a chemical reaction.
  5. 10. symbols The abbreviations used in balanced symbol equations to show if reactants and products are solid (s), liquid (l), gas (g) or aqueous/dissolved in water (aq).
  6. 13. When some elements and/or compounds are mixed together but do not react. They are physically combined.
  7. 14. A substance made when two or more elements are chemically bonded together.
  8. 15. number The number of protons in an atom (which is equal to the number of electrons). Sometimes called the proton number.
  9. 16. Atoms that have the same number of protons but different numbers of neutrons.
  10. 17. The smallest part of an element that can still be recognised as that element.
  11. 18. Subatomic particle with a relative charge of +1 and a relative mass of 1. Found in the nucleus.
  12. 19. A charged particle produced by the loss or gain of electrons.
  13. 21. The very small and dense central part of an atom that contains protons and neutrons.
  14. 25. indicator A mixture of indicators that can change through a range of colours to show how strongly acidic or alkaline liquids and solutions are.
  15. 26. Elements in group 7 of the periodic table.
  16. 27. A substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance.
Down
  1. 1. The columns that make up the periodic table (labelled 1-7 and 0).
  2. 2. number The number of protons + neutrons in the nucleus of an atom.
  3. 3. equation A way of describing what happens in a chemical reaction by showing the names of all reactants and the products they form.
  4. 4. metals Elements in group 1 of the periodic table.
  5. 8. Subatomic particle with a relative charge of 0 and a relative mass of 1. Found in the nucleus.
  6. 9. table An arrangement of elements in the order of their atomic number, forming groups and periods.
  7. 11. configuration A set of numbers to show the arrangement of electrons in their shells.
  8. 12. Substance(s) we start with before a chemical reaction takes place.
  9. 20. gases The very unreactive gases found in group 0 of the periodic table. Their atoms have very stable electronic structures.
  10. 22. Subatomic particle with a relative charge of -1 and very little mass. Found in shells around the nucleus.
  11. 23. of conservation of mass The total mass of the products formed in a reaction is equal to the total mass of the reactants.
  12. 24. equation A requirement for a symbol equation – the same number of atoms of each element on either side of the equation.