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CAIE IGCSE Chemistry Mass and Nucleon Number

CAIE IGCSE Chemistry Mass and Nucleon Number
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

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

How this is tested

  • 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

Question 2(c)

[Maximum number: 1]

Table 2.1 gives information about particles A, B, C, D, E and F.

Table 2.1

Table 2.1

Determine the number of nucleons in D.