# Diagnostic sheet

## Diagnosis Sheet

The prior Knowledge for mole concept

Define the following terms:

1. Relative Atomic Mass(Ar)
2. Relative Molecular Mass( Mr)
3. Relative Isotopic Mass
4. Relative Formula Mass

Explain the difference between simple average mass and weighted average mass.

Define mass number

The value of the mass number of an element is almost equal to its Relative Atomic Mass, why?

Use the mass spectrum to identify the relative isotopic masses

Hence calculate the relative atomic mass