Ionisation Energies The Ionisation Energy (IE) of an element is the amount of energy required to remove one mole of electrons from one mole of gaseous atoms of an element to form one mole of gaseou...
Determining Electronic Configurations Writing out the electronic configuration tells us how the electrons in an atom or ion are arranged in their shells, subshells and orbitals This can be done usi...
Electron Configurations: Basics The electron configuration gives information about the number of electrons in each shell, subshell and orbital of an atom The subshells are filled in order of increa...
Electron Orbitals Each shell can be divided further into subshells, labelled s, p, d and f Each subshell can hold a specific number of orbitals: s subshell : 1 orbital p subshell : 3 orbitals label...
Electron Shells: Basics Shells The arrangement of electrons in an atom is called the electronic configuration Electrons are arranged around the nucleus in principal energy levels or principal quant...
Isotopes: Basics Isotopes are atoms of the same element that contain the same number of protons and electrons but a different number of neutrons The symbol for an isotope is the chemical symbol (or...
Atomic & Ionic Radius Atomic radius The atomic radius of an element is a measure of the size of an atom It is half the distance between the two nuclei of two covalently bonded atoms of the same...
Determining the Subatomic Structure of Atoms & Ions An atom is neutral and has no overall charge Ions on the other hand are formed when atoms either gain or lose electrons, causing them to beco...
Mass & Charge Distribution The mass of an atom is concentrated in the nucleus, because the nucleus contains the heaviest subatomic particles (the neutrons and protons) The mass of the electron ...
