1:16 know what is meant by the terms atomic number, mass number, isotopes and relative atomic mass (Aᵣ)

Atomic number: The number of protons in an atom.

Mass number: The number of protons and neutrons in an atom.

Isotopes: Atoms of the same element (same number of protons) but with a different number of neutrons.

Relative atomic mass (A_r): The average mass of an atom compared to 1/12th the mass of carbon-12.

Past paper questions on spec point:

Spec	Q'stion	Ans	MS
1:16	Jan '12 (2), Q 1 b i	Answer	MkS
1:16	Jan '12 (2), Q 1 b ii	Answer	MkS
1:16	Jan '13 (1), Q 9 a i	Answer	MkS
1:16	Jan '13 (1), Q 9 a ii	Answer	MkS
1:16	Jan '13 (1), Q 9 a iv	Answer	MkS
1:16	Jan '14 (2), Q 1 b i	Answer	MkS
1:16	Jan '14 (2), Q 1 b ii	Answer	MkS
1:16	Jan '14 (2), Q 1 d	Answer	MkS
1:16	Jan '15 (1), Q 1 c	Answer	MkS
1:16	Jan '16 (1), Q 2 b i	Answer	MkS
1:16	Jan '17 (1), Q 4 a iii	Answer	MkS
1:16	Jan '18 (2), Q 2 d i	Answer	MkS
1:16	May '10 (1), Q 3 a ii	Answer	MkS
1:16	May '10 (1), Q 3 b i	Answer	MkS
1:16	May '11 (1), Q 1 c ii	Answer	MkS
1:16	May '11 (1), Q 1 d i	Answer	MkS
1:16	May '11 (1), Q 1 d ii	Answer	MkS
1:16	May '12 (1), Q 6 a	Answer	MkS
1:16	May '12 (1), Q 6 b	Answer	MkS
1:16	May '12 (1), Q 6 c i	Answer	MkS
1:16	May '13 (1), Q 1 a i	Answer	MkS
1:16	May '13 (1), Q 1 a ii	Answer	MkS
1:16	May '13 (1), Q 1 a iii	Answer	MkS
1:16	May '13 (1), Q 1 a iv	Answer	MkS
1:16	May '13 (1), Q 1 a v	Answer	MkS
1:16	May '13 (1), Q 1 b i	Answer	MkS
1:16	May '13 (1), Q 1 b ii	Answer	MkS
1:16	May '14 (2), Q 3 c i	Answer	MkS
1:16	May '14 (2R), Q 1 d i	Answer	MkS
1:16	May '14 (2R), Q 1 d ii	Answer	MkS
1:16	May '15 (2), Q 1 a ii	Answer	MkS
1:16	May '15 (2), Q 1 a iii	Answer	MkS
1:16	May '15 (2), Q 1 c i	Answer	MkS
1:16	May '16 (1), Q 6 b i	Answer	MkS
1:16	May '16 (1R), Q 1 a	Answer	MkS
1:16	May '16 (1R), Q 1 b	Answer	MkS
1:16	May '16 (2R), Q 5 a i	Answer	MkS
1:16	May '17 (1R), Q 4 a i	Answer	MkS
1:16	May '17 (2R), Q 1 a ii	Answer	MkS
1:16	May '17 (2R), Q 1 b	Answer	MkS