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