atomic structure

• What are the alkali metals in the periodic table?

  The elements in Group 1 of the periodic table
• What is an atom?

  The smallest part of an element that can exist
• What is the atomic nucleus composed of?

  Protons and neutrons
• What does the atomic number represent?

  The number of protons in the nucleus
• What is chromatography used for?

  To separate a mixture of chemicals by distributing the components between two phases
• What is a compound?

  A substance made up of two or more types of atoms chemically combined together
• What is crystallisation used for?

  To produce solid crystals from a solution by evaporating the solvent
• What is displacement in chemistry?

  A chemical reaction in which a more reactive element displaces a less reactive element from its compound
• What is an electron?

  A negatively charged subatomic particle that orbits the nucleus
• What are electron shells?

  Different energy levels in atoms occupied by electrons
• What is an element?

  A substance made up of only one type of atom
• What is filtration used for?

  To separate solids from liquids
• What is fractional distillation?

  A method of separating a mixture of substances according to their different boiling points
• What does a group in the periodic table represent?

  Columns of elements with similar properties
• What are halogens?

  The elements in Group 7 of the periodic table
• What is an ion?

  An atom or molecule with an electric charge due to the loss or gain of electrons
• What is an isotope?

  Atoms of the same element with the same number of protons but a different number of neutrons
• What is the mass number?

  The total number of protons and neutrons in the nucleus
• What are metals?

  Elements that react to form positive ions
• What is a mixture?

  A mixture consists of two or more elements or compounds not chemically combined together
• What is a neutron?

  A neutral subatomic particle present in the nucleus of the atom
• What are noble gases?

  The elements in Group 0 of the periodic table
• What are non-metals?

  Elements that react to form negative ions
• What is the nuclear model of the atom?

  The model that states mass is concentrated at the centre of the atom and that the nucleus is charged
• What is the periodic table?

  A table of elements arranged in order of atomic number
• What is the plum pudding model?

  An atomic model suggesting the atom is a ball of positive charge with negative electrons scattered through it
• What is a proton?

  A positively charged subatomic particle present in the nucleus of the atom
• What is relative atomic mass?

  An average value that takes account of the abundance of the isotopes of the element
• What is simple distillation?

  A procedure by which two liquids with different boiling points can be separated
• What are transition metals?

  The collection of metallic elements in the middle of the periodic table