OCR Chemistry Definitions 1.2

Question	Answer
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	A measure of the energy required to remove each electron in turn. For example, the second ionisation energy of an element 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
Obital	Region that can hold up to two electrons, with opposite spins
S Orbital	Spherical Shape
P Orbital	3D dumb-bell shape at right angles to each other
Ionic bonding	electrostatic attraction between opppositely charged ions
Covalent Bond	bond formed by a shared pair of electrons
Electronegativity	The ability of an atom to attract the bonding electrons in a covalent bond
Image: 186462b4-3613-44d4-b6dd-78208887715c (image/jpg)	Boron Triflouride: 3 bonded pairs Bond angle: 120 Trigonal Planar
Image: 134d3fe9-9651-4ca5-991a-5f385bc1a0ee (image/jpg)	Methane: 4 bonded pairs bond angle: 109.5 Tetrahedral
Image: b2224615-3fa8-462e-86cc-1f3d963eeba2.gif (image/gif)	Sulphur Hexaflouride 6 bonded electron pairs bond angle: 90 Octahedral
Image: 5a52a647-5d48-464f-8da9-fe46281bd92c (image/jpg)	Ammonia bond angle: 107 pyramidal
Image: 8f4bd61a-d34e-4629-9f20-dd60b70ae5e3 (image/jpg)	Water bond angle: 104.5 non-linear
Image: d3bcdf64-1844-4baf-b23b-9da3429b8b5c (image/jpg)	CO2 bond angle: 180 Linear
Metallic Bonding	the attraction of positive ions to delocalised electrons

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