Ions and Formula Units Worksheet
Explore the fundamentals of ions, ionic bonding, and writing chemical formulas for ionic compounds at a Grade 9 level.
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Ions and Formula Units
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Read each question carefully and provide the best answer based on your understanding of ions and formula units.
1. What is an ion?
An atom with a neutral charge
An atom that has gained or lost electrons
A molecule with a positive charge
A compound formed by sharing electrons
2. Which of the following is a cation?
Cl-
O2-
Na+
SO4 2-
3. A positively charged ion is called a , while a negatively charged ion is called an .
4. Ionic compounds are formed between a and a .
5. The smallest whole-number ratio of ions in an ionic compound is called a .
6. Explain how an atom becomes a cation and how it becomes an anion.
Match the ion with its correct charge.
7. Calcium
a. -1
8. Oxygen
b. +2
9. Chlorine
c. -2
10. Write the chemical formula for the ionic compound formed between Potassium (K+) and Bromine (Br-).
11. Write the chemical formula for the ionic compound formed between Magnesium (Mg2+) and Oxygen (O2-).
12. Write the chemical formula for the ionic compound formed between Aluminum (Al3+) and Sulfate (SO4 2-).