CAIE IGCSE Chemistry Mass and Nucleon Number

Practise defining nucleon number, reading isotope notation and calculating proton or neutron counts by combining atomic number with mass number.

Exam points

define mass or nucleon number as the total number of protons and neutrons in one nucleus
calculate neutrons by subtracting proton number from nucleon number in isotope notation
distinguish nuclei with equal nucleon numbers by checking whether their proton numbers differ

[Maximum number: 1]

This question is about elements X, Y and Z.

An atom of element X is represented as ${ }_{16}^{34} \mathbf{X}$ .

What is the term for the total number of particles in the nucleus of an atom?

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