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CAIE A-Level Chemistry 1.1.6 Numbers of Protons, Neutrons and Electrons

Practise determining proton, neutron and electron counts in atoms and ions from nuclide notation and charge.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • set proton count equal to atomic number and neutron count equal to mass number minus atomic number
  • set electron count equal to proton count when the species is a neutral atom
  • subtract electrons for a positive charge and add electrons for a negative charge without changing the nucleus

1.1.6—Determine the numbers of protons, neutrons question 1

[Maximum number: 2]

All the Group 2 elements except beryllium have more than one stable isotope.

Complete Table 2.2 to show the numbers of protons and neutrons in the isotopes of magnesium.

Table 2.2

Table 2.2

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