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CAIE IGCSE Chemistry Proton and Atomic Number

Practise defining proton number, reading it from nuclear or particle data and using the proton count to identify an element or compare particles.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • define proton or atomic number as the number of protons in the nucleus of one atom
  • read a proton count from particle or nuclear data and use it to identify the element
  • recognise particles as the same element when their nuclei contain the same number of protons

2.2.3—Proton number/atomic number as the question 1

[Maximum number: 1]

The table gives the composition of three particles.

Table for Question 2.2.3—Proton number/atomic number as the question 1 — CAIE IGCSE Chemistry

What is the evidence in the table for each of the following?

A, B and C are all particles of the same element.

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