CIE A Level Chemistry复习笔记1.2.1 Relative Masses
Relative Masses Atomic Mass Unit The mass of a single atom is so small that it is impossible to weigh it directly Atomic masses are therefore defined in terms of a standard atom which is called the...
CIE A Level Chemistry复习笔记1.1.12 Ionisation Energies & Electronic Configurations
Ionisation Energies: Explained Energy is required to remove an outer shell electron as this involves breaking the attractive forces between the electron and the positively charged nucleus There are...
CIE A Level Chemistry复习笔记1.1.11 Ionisation Energy Trends
Ionisation Energies: Trends Ionisation energies show periodicity - a trend across a period of the Periodic Table As could be expected from their electronic configuration, the group I metals have a ...
CIE A Level Chemistry复习笔记1.1.10 Ionisation Energy
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...
CIE A Level Chemistry复习笔记1.1.9 Determining Electronic Configurations
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...
CIE A Level Chemistry复习笔记1.1.8 Electron Configuration
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...
CIE A Level Chemistry复习笔记1.1.7 Electron Subshells & Orbitals
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...
CIE A Level Chemistry复习笔记1.1.6 Electronic Structure
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...
CIE A Level Chemistry复习笔记1.1.5 Isotopes
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...
