CAIE IGCSE Chemistry 2.4.1 Formation of positive ions, known as
Practise describing how atoms become cations or anions and using proton and electron counts to explain ion charges.
- Syllabus
- 2026–2028
- Course
- Chemistry 0620
Exam points
- describe cations as atoms that lose outer-shell electrons and anions as atoms that gain electrons
- choose the correct electron transfer when metals react with non-metals
2.4.1—Formation of positive ions, known as question 1
[Maximum number: 5]
The Periodic Table is a method of classifying elements.
Calcium is in Group II and chlorine is in Group VII of the Periodic Table.
Explain, in terms of number of outer shell electrons and electron transfer, how calcium atoms and chlorine atoms form ions. Give the formulae of the ions formed.
Ca has 2 and Cl has outer electrons 7 (1)
Ca (atoms) lose electrons (1)
Cl (atoms) gain electrons (1)
Ca2+ (ions) (1)
Ct (ions) (1)
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