_AS_ 1 Flashcards
Water of crysrallisation
Water molecules that form an essential part of the crystalline structure of a compound
Disproportionation
The oxidation and reduction of the same element in a redox reaction
Empirical formula
The simplest whole number ratio of atoms of each element present in a compound
Molecular formula
The number of atoms of each element in a molecule
Relative atomic mass
Ar
The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of carbon-12
Relative isotopic mass
The mass of an atom of an isotope compared to 1/12th of the mass of an atom of carbon-12
First Ionisation energy
The energy required to remove One Electron from EACH ATOM in one mole of Gaseous atoms to Form one mole of Gaseous 1+ ions
Successive Ionisation energy
The energy required to remove each electron in turn.
e.g. The second ionisation energy is the energy required to remove one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions
Isotopes
Atoms of the same element with different numbers of neutrons and different masses
Atomic orbital
A region within an atom that can hold up to Two Electrons with Opposite spins
Electronegativity
The ability of an atom to attract a pair of electrons
IN a COVALENT BOND
added - CHECK - in past paper f321
Hydrogen Bonding
A strong dipole-dipole attraction between an ELECTRON DEFICIENT hydrogen atom On one molecule
and
a Lone pair of electrons on a highly electronegative atom on a different molecule
Dative covalent Bonding
NH4 +
A shared pair electrons which has been provided by one of the bonding atoms only,
also called a coordinate bond
Metallic bonding
The electrostatic attraction between a positive metal ion and delocalised electrons
Ionic bonding
The electrostatic attraction between oppositely charged ions
