Atomic structure

Question 1

Relative isotopic mass

Answer 1

The mass of one atom of that isotope relative to one twelfth of a carbon-12 atom

Question 2

Relative atomic mass

Answer 2

The weighted average mass of one atom of the element compared to one twelfth of a carbon-12 atom

Question 3

Relative molecular mass

Answer 3

The sum of all the relative atomic masses of all the atoms which make up the compounds formula

Question 4

Isotopes

Answer 4

Same number of protons but varying number of neutrons (same atomic number but different mass number)