Chemistry Definitions

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coordinate bond
A shared pair of electrons which has been provided by one of the bonding atoms only; also called a dative covalent bond.
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covalent bond
A bond formed by a shared pair of electrons.
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dative covalent
A shared pair of electrons which has been provided by one of the bonding atoms only; also called a coordinate bond.
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delocalised electrons
Electrons that are shared between more than two atoms.
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electronegativity
A measure of the attraction of a bonded atom for the pair of electrons in a covalent bond.
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giant covalent lattice
A three-dimensional structure of atoms, bonded together by strong covalent bonds.
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giant ionic lattice
A three-dimensional structure of oppositely charged ions, bonded together by strong ionic bonds.
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giant metallic lattice
A three-dimensional structure of positive ions and delocalised electrons, bonded together by strong metallic bonds.
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hydrogen bond
A strong dipole–dipole attraction between an electron-deficient hydrogen atom (O–Hδ+ or N–Hδ+) on one molecule and a lone pair of electrons on a highly electronegative atom (H–O:δ– or H–N:δ–) on a different molecule.
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intermolecular force
An attractive force between neighbouring molecules. Intermolecular forces can be van der Waals’ forces (induced dipole–dipole forces), permanent dipole–dipole forces or hydrogen bonds.
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ionic bonding
The electrostatic attraction between oppositely charged ions.
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lone pair
An outer-shell pair of electrons that is not involved in chemical bonding.
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metallic bond
The electrostatic attraction between positive metal ions and delocalised electrons.
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molecule
A small group of atoms held together by covalent bonds.
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periodicity
A regular periodic variation of properties of elements with atomic number and position in the Periodic Table.
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permanent dipole
A small charge difference across a bond resulting from a difference in electronegativities of the bonded atoms.
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permanent dipole–dipole force
An attractive force between permanent dipoles in neighbouring polar molecules.
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pi-bond (π-bond)
The reactive part of a double bond formed above and below the plane of the bonded atoms by sideways overlap of p-orbitals.
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polar covalent bond
A bond with a permanent dipole.
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polar molecule
A molecule with an overall dipole, taking into account any dipoles across bonds.
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simple molecular lattice
A three-dimensional structure of molecules, bonded together by weak intermolecular forces.
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van der waals'
Very weak attractive forces between induced dipoles in neighbouring molecules.
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volatility
The ease that a liquid turns into a gas. Volatility increases as boiling point decreases.
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Other cards in this set

Card 2

Front

A bond formed by a shared pair of electrons.

Back

covalent bond

Card 3

Front

A shared pair of electrons which has been provided by one of the bonding atoms only; also called a coordinate bond.

Back

Preview of the back of card 3

Card 4

Front

Electrons that are shared between more than two atoms.

Back

Preview of the back of card 4

Card 5

Front

A measure of the attraction of a bonded atom for the pair of electrons in a covalent bond.

Back

Preview of the back of card 5
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