CIE A Level Chemistry復(fù)習(xí)筆記1.2.3 Formulae
Formulae of Ionic Compounds Ionic?compounds?are formed from a?metal?and a?nonmetal?bonded together Ionic compounds are electrically neutral; the positive charges equal the negative charges Charges ...
CIE A Level Chemistry復(fù)習(xí)筆記1.2.2 The Mole & Avogadro Constant
Mole & Avogadro Constant The?Avogadro constant?(NA?or?L) is the number of particles equivalent to the relative?atomic?mass?or?molecular mass?of a substance The Avogadro constant applies to atom...
CIE A Level Chemistry復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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復(fù)習(xí)筆記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...
