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Ionisation energies

What is an 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
What is electron shielding? The repulsion between electrons in different inner shells
What 3 factors affect ionisation energies? Atomic radius, nuclear charge and electron shielding
How many electrons can an s-orbital hold? 2 electrons
How many electrons can a p-orbital hold? 6 electrons
What is an ionic bond? The electrostatic attraction between oppositely charged ions
What is a covalent bond? A bond formed by a shared pair of electrons
What is a lone pair? An outer-shell of electrons not involved in chemical bonding
What is a dative covalent bond? A shared pair of electrons provided by only one of the bonding atoms
What is the bond angle of a trigonal planar? 120 degrees
What is the bond angle of a tetrahedral? 109.5 degrees
What is the bond angle and shape of water? Non-linear, 104.5 degrees
What is electronegativity? A measure of the attraction of a bonded pair of electrons in a covalent bond
What is a permanent dipole? A small charge difference across a bond
What is a permanent dipole-dipole force? A weak attractive force between permanent dipoles in neighbouring polar molecules
What are van der Waals forces? Attractive forces between induced dipoles in neighbouring molecules
What is a hydrogen bond? S strong dipole-dipole attraction between an electron deficient H atom on one molecule and a lone pair of electrons on a highly electronegative atom on a different molecule
What is metallic bonding? The electrostatic attraction between positive metal ions and delocalised electrons
Created by: Shajida



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