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AS Chemistry OCR A: Unit 1:2 - Electrons, Bonding and Structure
AS Level chemistry OCR A. Unit 1, F321 - Atoms, bonds and groups. Module 2 - Electrons, bonding and structure. All keywords from textbook. 28 keywords.
Terms in this set (28)
Successive ionisation energy
A measure of the energy required to remove each electron in turn.
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.
Second ionisation energy
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.
The repulsion between electrons in different inner shells.
Principal quantum number
A number representing the relative overall energy of each orbital, which increases with distance from the nucleus.
A group of atomic orbitals with the same principal quantum number.
A group of the same type of atomic orbitals (s, p, d or f) within a shell.
A region within an atom that can hold up to two electrons with opposite spins.
The arrangement of electrons in an atom.
A substance formed from two or more chemically bonded elements in a fixed ratio, usually shown by a chemical formula.
The electrostatic attraction between oppositely charged ions.
Giant ionic lattice
A three-dimensional structure of oppositely charged ions, held together by strong ionic bonds.
A vertical column in the Periodic Table. Elements in the same group have similar chemical properties and their atoms have the same number of outer-shell electrons.
A bond formed by a shared pair of electrons.
An outer-shell pair of electrons that is not involved in chemical bonding.
Dative covalent bond
A shared pair of electrons which has been provided by one of the bonding atoms only.
A measure of the attraction of a bonded atom for the pair of electrons in a covalent bond.
A small charge difference across a bond that results from a difference in the electronegativities of the bonded atoms.
Polar covalent bond
A permanent dipole.
An attractive force between neighbouring molecules.
Permanent dipole-dipole force
A weak attractive force between permanent dipoles in neighbouring polar molecules.
van der Waals' forces
Attractive forces between induced dipoles in neighbouring molecules.
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.
The electrostatic attraction between positive metal ions and delocalised electrons.
Electrons shared between more than two atoms.
Giant metallic lattice
A three-dimensional structure of positive ions and delocalised electrons, bonded together by strong metallic bonds.
Simple molecular lattice
A three-dimensional structure of molecules, bonded together by weak intermolecular forces.
Giant covalent lattice
A three-dimensional structure of atoms, bonded together by strong covalent bonds.
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