DEFINITIONS

Question 1

electrostatic attraction

Answer 1

occurs between oppositely charged particles

Question 2

atomic mass

Answer 2

sum of the total number of protons and neutrons in an atom

Question 3

atomic number

Answer 3

the number of protons in an atom (= no of electrons)
defines what the element is

Question 4

isotope

Answer 4

an atom of an element with the same number of protons but a different number of neutrons

Question 5

ion

Answer 5

an atom that has lost of gained an electron

Question 6

volatile

Answer 6

easily vaporises and has a relatively low boiling point

Question 7

relative atomic mass

Answer 7

the average mass of an atom of an element compared to one twelfth of C-12 on a scale in which C-12 has a mass of exactly 12

Question 8

relative isotopic mass

Answer 8

the average mass of an isotope of an element compared to one twelfth C-12 on a scale in which C-12 has a mass of exactly 12

Question 9

relative molecular mass

Answer 9

the sum of the Ar of the atoms within the molecule

Question 10

first ionisation energy

Answer 10

energy needed to remove 1 e- from each atom in 1 mole of gaseous atoms to form, 1mole of gaseous 1+ ions

Question 11

ionic bonding

Answer 11

formation of bonds between atoms caused by transfer of electrons.

Question 12

molecular ions

Answer 12

ions held by covalent bonds but hold ionic properties and carry a charge

Question 13

covalent bonding

Answer 13

formation of bonds between atoms caused by the sharing of electrons

Question 14

coordinate bonding

Answer 14

both electrons from the shared pair are given by one species of atom

Question 15

electronegativity

Answer 15

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