1(c) Atomic structure

Question 1

Isotope definition

Answer 1

atoms of same element with the same number of protons but different numbers of neutrons

Question 2

Atom definition

Answer 2

The smallest particle of an element that contains electrons surrounding a nucleus that contains protons and neutrons

Question 3

Molecule definition

Answer 3

A group of two or more atoms chemically combined

Question 4

electron mass

Answer 4

1/2000 OR Very small
(both give marks)

Question 5

Atomic number

Answer 5

The number of protons in the nucleus of an atom

Question 6

Mass number

Answer 6

Neutron + Protons in nucleus of atom

Question 7

Relative atomic mass

Answer 7

The average mass of one atom of an element