CourseCourseConceptConcept

CAIE IGCSE Chemistry 2.2.4 Mass Number Nucleon Number As the Questions

Work with mass number in CAIE IGCSE Chemistry by counting protons and neutrons in a nucleus, then using their total to calculate and compare particle numbers.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • Define mass or nucleon number as the total number of protons and neutrons in an atom's nucleus.
  • Add proton and neutron counts from a particle table to determine the nucleon number.
  • Subtract proton number from mass number to find neutrons, including zero neutrons in hydrogen-1.
  • Compare nuclear totals to identify equal nucleon numbers or explain differing neutron counts at equal mass number.

CAIE IGCSE Chemistry 2.2.4 Mass Number Nucleon Number As the Questions question 1

[Maximum number: 1]

4 X and Y are two different elements.
X and Y have the same number of nucleons.
Which statement about X and Y is correct?

A

They have the same physical properties.

B

Their atoms have the same number of electrons.

C

They are in different groups of the Periodic Table.

D

They have different relative masses.

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