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CAIE IGCSE Chemistry 2.4.1 Formation of Positive Ions Known As Questions

Explain ion formation in CAIE IGCSE Chemistry by linking electron loss or gain to positive or negative charge, checking proton and electron numbers and writing ion symbols.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • Describe positive-ion formation by electron loss and negative-ion formation by electron gain, keeping the number of protons unchanged.
  • Use the difference between proton and electron numbers to identify cations or anions and justify the size and sign of an ion charge.
  • Select or write the correctly charged ion symbol after electron loss or gain.

CAIE IGCSE Chemistry 2.4.1 Formation of Positive Ions Known As Questions question 1

[Maximum number: 1]

Magnesium reacts with oxygen to form magnesium oxide.
What happens to magnesium atoms and oxygen atoms during this reaction?

A

Magnesium and oxygen share two electrons.

B

Magnesium gains two electrons and oxygen loses two electrons.

C

Magnesium loses one electron and oxygen gains one electron.

D

Magnesium loses two electrons and oxygen gains two electrons.

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