Defintions

Question 1

Relative isotopic mass

Answer 1

Mass of an atom of one isotope compared to 1/12th of carbon 12

Question 2

Relative atomic mass

Answer 2

Average weighted mean mass of an atom of an element compared to 1/12th of carbon 12

Question 3

Relative molecular mass

Answer 3

Average mass of one molecule of an element or compound to one twelfth of carbon 12

Question 4

Ionic bonding

Answer 4

Electrostatic attraction between oppositely charged ions acting in all directions

Question 5

Covalent bonding

Answer 5

Strong electrostatic attraction between a shared pair of electrons and nuclei of bonded atoms

Question 6

Electronegativity

Answer 6

Ability of an atom to attract the pair of electrons in a covalent bond to itself

Question 7

Periodicity

Answer 7

Repeating pattern across different periods in either physical or chemical properties

Question 8

First ionisation energy

Answer 8

Energy needed to remove an electron from each atom in one mole of gaseous atoms to form one mole of gaseous ions of charged ions

Question 9

Metallic bonding

Answer 9

Electrostatic force of attraction between the positive metal ion and the delocalised electron