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Module 2

What is the 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.
What is electron shielding? The repulsion between electrons in different inner shells. Shielding reduces the attractive force between the electrons and the nucleus.
How many electrons are in an S orbital? 2
What is an ionic bond? The electrostatic attraction between oppositely charged ions.
Does a group in the periodic table go down or across the periodic table? Down.
What is a covalent bond? A shared pair of electrons.
What is a lone pair? A pair of outer-shell electrons that is not involved in chemical bonding.
What is a dative covalent bond? A shared pair of electrons which are provided by one of the bonding atoms.
What is the bond angle in a trigonal planar? 120
What is electronegativity? The measure of the attraction of a bonded atom for the pair of electrons in a covalent bond.
What is a permanent dipole? A small charge difference across a bond that results from a difference in the electronegativities of the bonded atoms.
What is intermolecular force? An attractive force between neighbouring molecules.
What are van der Waals' forces? Attractive forces between induced dipoles in neighbouring molecules.
Created by: stu038078