isotopes as atoms of the same element with different numbers of neutrons and different masses

atomic structure in terms of the numbers of protons, neutrons and electrons for atoms and ions, given the atomic number, mass number and any ionic charge

explanation of the terms relative isotopic mass(mass compared with 1/12th mass of carbon-12) and relative atomic mass (weighted mean mass compared with 1/12th mass of carbon-12), based on the mass of a ¹²C atom, the standard for atomic masses

Definitions required.

use of mass spectrometry in:

(i) the determination of relative isotopic masses and relative abundances of the isotope,
(ii) calculation of the relative atomic mass of an element from the relative abundances of its isotopes

Knowledge of the mass spectrometer not required.
Limited to ions with single charges.

use of the terms relative molecular mass, M_r, and relative formula mass and their calculation from relative atomic masses.

For simple molecules, the term relative molecular mass will be used.
For compounds with giant structures, the term relative formula mass will be used.
Definitions of relative molecular mass and relative formula mass will not be required.