Currently Empty: $0.00
Lesson 12: Atoms vs Elements vs Compounds Clear comparison Particle diagrams Exam-style classification questions
Year 8 • Chemistry
Atoms vs Elements vs Compounds
In this lesson, students clearly compare atoms, elements, and compounds using definitions, particle diagrams, and exam-style classification questions.
Lesson Objectives
- Define atoms, elements, and compounds.
- Identify substances using particle diagrams.
- Compare elements and compounds clearly.
- Answer exam-style classification questions.
1. What Is an Atom?
An atom is the smallest particle of an element that can exist.
[ Image Placeholder – Single Atom Particle Diagram ]
Key ideas:
• Atoms are extremely small
• Each element has its own type of atom
• Atoms cannot be broken down chemically
• Atoms are extremely small
• Each element has its own type of atom
• Atoms cannot be broken down chemically
2. What Is an Element?
An element is a substance made of only one type of atom.
[ Image Placeholder – Element Particle Diagram ]
Examples:
• Oxygen → only oxygen atoms
• Iron → only iron atoms
• Gold → only gold atoms
• Oxygen → only oxygen atoms
• Iron → only iron atoms
• Gold → only gold atoms
3. What Is a Compound?
A compound is a substance made when two or more different elements are chemically joined.
[ Image Placeholder – Compound Particle Diagram ]
Examples:
• Water (H₂O)
• Carbon dioxide (CO₂)
• Sodium chloride (NaCl)
• Water (H₂O)
• Carbon dioxide (CO₂)
• Sodium chloride (NaCl)
4. Clear Comparison
Atom: single particle of an element
Element: one type of atom only
Compound: different atoms chemically bonded
Element: one type of atom only
Compound: different atoms chemically bonded
Key exam tip:
If different atoms are joined together → it is a compound.
5. Particle Diagrams & Classification
[ Image Placeholder – Multiple Particle Diagrams ]
Classification rules:
• Same atoms only → element
• Different atoms joined → compound
• Single atom shown → atom
• Same atoms only → element
• Different atoms joined → compound
• Single atom shown → atom
Exam-Style Questions
A. Classify Each Substance
- A diagram showing only oxygen atoms.
- A diagram showing hydrogen and oxygen atoms joined.
- A single carbon atom.
- Iron atoms only.
- Sodium and chlorine atoms joined.
B. True or False
- An element contains only one type of atom.
- A compound contains different atoms.
- An atom is smaller than an element.
- Water is an element.
- Carbon dioxide is a compound.
C. Short Answer
- What is an atom?
- How is an element different from a compound?
- Why is water not an element?
- What does a particle diagram show?
- Give one example of a compound.
✅ Show Answer Key
A. Classification
- Element
- Compound
- Atom
- Element
- Compound
B. True or False
- True
- True
- True
- False
- True
C. Short Answer
- The smallest particle of an element.
- Elements have one atom type; compounds have different atoms joined.
- It contains hydrogen and oxygen.
- The arrangement of atoms.
- Water / CO₂ / salt.
© Aviate Learning – Atoms vs Elements vs Compounds (Year 8)
⚛️ Interactive Particle Diagram Classifier
Look at the particle diagram and decide whether it represents an
Atom, an Element, or a Compound.
Diagram will appear here
Click a button to classify the diagram.