EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Molecules, Ions and FormulaeConceptualBoard Exam
Write the ion formed in each case, and say whether it is a cation or an anion…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Write the ion formed in each case, and say whether it is a cation or an anion.
- A potassium atom loses electron.
- A calcium atom loses electrons.
- A sulphur atom gains electrons.
- A fluorine atom gains electron.
Need a reminder? The key ideaShow
An ion is an atom or group of atoms with a charge. Losing electrons makes a cation (positive); gaining electrons makes an anion (negative); the protons do not change. An ionic compound is neutral: its charges add up to zero.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) , a cation.
Step 2. (b) , a cation.
Step 3. (c) , the sulphide ion, an anion.
Step 4. (d) , the fluoride ion, an anion.
Answer: and are cations; and are anions.
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