Across
- 5. a table of all the chemical elements in order of their atomic numbers
- 7. atoms with the same number of protons but different numbers of neutrons
- 9. within the periodic table the vertical columns are called...
- 12. the metals in Group 1 of the periodic table
- 13. chemical that speeds up a reaction but is not used up by the reaction
- 15. the density of a substance is its mass divided by its volume
- 17. two or more elements which are chemically joined together, e.g. H2O
- 19. a property of matter, charge exists in two forms, positive and negative, which attract each other
- 20. two or more atoms covalently bonded to form the smallest unit of an element or compound, e.g. O2, H2O
- 22. particle which does not have a charge found in the nucleus of an atom
- 23. shiny
- 25. the number of protons in the nucleus of an atom
- 26. central part of an atom that contains protons and neutrons
Down
- 1. reaction chemical reaction where an element takes the place of or ‘pushes out’ another element from a compound
- 2. elements with properties of both metals and non-metals; in the periodic table they are between metals and non-metals
- 3. small negatively charged particles within an atom that are outside the nucleus
- 4. a row in the periodic table
- 6. a method for separating substances, used to identify compounds and check for purity
- 8. positively charged particles found in the nucleus of an atom
- 10. compounds which produce hydroxide ions in water
- 11. materials that let electricity pass through them
- 14. used to show pH of a solution or when the end point of a titration is reached
- 16. substances made out of only one type of atom with the same number of protons in the nucleus
- 18. the process of using a porous material to remove solids from water or solutions
- 21. reactive non-metals in Group 7 of the periodic table, e.g. chlorine
- 24. charged particles (can be positive or negative)