• Understand that the atom is the smallest part of an clement that has Its characteristic properties.    • Understand that there are three fundamental particles which mako up an atom namely tho proton, the neutron and the eloctron.    • Know the relative mass and charge of the proton, the neutron and the electron, and their position In the atom.    • Know that the atomic no. is equal to the number of protons in an atom.    • Know that the mass number is equal to the sum of the protons plus neutrons in an atom.    • Be able to use the atomic number + the atomic mass no. to deduce the no. of protons and electrons and neutrons present.    • Know the definition of an isotope.    • Recognise that elements exist as Isotopes and bo able to Identify examples.    • Know that the electrons are ordered in shells In an atom.    • Be able to write and draw the electronic structures of elements from 1 to 20 and know their chemical symbols.    • To present the structure of atoms diagrammatically.    • Know that an Ion is a charge species formed by the loss or gain of electrons. Use the formation of Na ' and Cl ' as typical examples of positive and negative ions.