CAIE IGCSE Chemistry Defining Relative Atomic Mass

Practise stating the complete relative atomic mass definition, including the isotopic average and comparison with one twelfth of a carbon-12 atom.

Exam points

define relative atomic mass as the weighted average mass of an element's naturally occurring atoms
state that the comparison standard is one twelfth of the mass of one carbon-12 atom
recognise carbon-12 as the isotope that fixes the relative-mass scale at exactly twelve

[Maximum number: 1]

This question is about elements X, Y and Z.

Identify the atom against which the relative masses of all other atoms are compared.

${ }^{12} \mathrm{C}$

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