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Module 2
Question | Answer |
---|---|
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. |