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