Details

Title: Definitions

Description: UK AS Definitions

Total Flash Cards: 13

Created: 10/27/2007 11:54:17

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Term
First Ionisation Energy
 Definition
The energy required to remove one electron from each atom in one mole of gaseous atoms.
Term
Relative atomic mass
 Definition
The average mass of one atom of that element compared to 1/12 mass of an atom of carbon-12
Term
Electronegativity
 Definition
A measure of the ability of an element to attract electrons in a covalent bond to itself.
Term
Covalent Bond
 Definition
A shared pair of electrons
Term
Ionic Bond
 Definition
The electrostatic attraction between oppositely charged ions.
Term
One Mole
 Definition
The amount of substance that contains as many elementary units as there are atoms in 12g of carbon-12
Term
Avogadro constant
 Definition
6 x 10^23
Term
Dative covalent Bond  ( Coordinate Bond)
 Definition
A covalent bond where both of the shared electrons come from one species.
Term
Relative molecular mass
 Definition
The average mass of one molecule of that subtance compared to 1/12 mass of an atom of carbon-12
Term
Atomic Number
 Definition
The number of protons in an atom of the element
Term
Mass Number
 Definition
The number of protons plus neutrons in an atom of the element
Term
Isotopes
 Definition
Atoms of an element with different numbers of neutrons.  (with the same atomic number but different mass numbers)
Term
Hydrogen bond
 Definition
An intermolecular force between a hydrogen atom in one molecule and a lone pair of electrons on N, O  or F in another molecule.