Inside Atoms: Elements, Compounds & Mixtures
Particles of Matter: Elements, Compounds & Mixtures
Items in this lesson
Particles of Matter: Elements, Compounds & Mixtures
What do you already know about particles of matter?
Learning Intentions & Success Criteria
At the end of the lesson you will:
• Define 'atom', 'element', 'molecule', and 'compound'.
• Build models / create diagrams of elements, molecules, and compounds.
• Interpret simple chemical formulae of molecules and compounds.
Inside the Atom
Atomic Rules
Summary Rule Box
Protons = atomic number
Electrons = protons (neutral atom)
Neutrons = mass number − atomic number
Neutrons + Protons = mass number
What do you notice about each of these?
What is similar?
What is different?
They all represent matter made of particles.
one particle 2. same particles joined 3. different particles joined.
Which is the atom? Why?
Which is the molecule? Why?
Which is the compound? Why
CHEMISTRY RULES
ATOM
= one particle
= smallest part of an element
= made of smaller particles
MOLECULE
= two or more atoms bonded
= atoms joined together
= same or different atoms
ELEMENT
= one type of atom
= pure substance
= found on the periodic table
COMPOUND
= different elements bonded
= pure substance
= has a chemical formula
Building Models
Use the supplied items to build:
• An atom
• An element
• An molecule
• A compound
Label your models using scientific terms.
Chemical Formula
A chemical formula shows:
Which elements are in a substance
How many atoms of each element there are
FORMULA RULES
Capital letter = start of a new element
Lowercase letter = part of the same element
Small number after a symbol = number of atoms
No number = 1 atom
Add subscripts to find total atoms
Glossary
Use the notes, diagrams, and examples to complete the table.
You may use dot points or short sentences.
The Building Blocks
• Atom: The smallest part of an element.
• Element: Made of only one type of atom.
• Molecule: Two or more atoms joined together.
• Compound: Made from atoms of two or more elements joined together.
Quick Quiz: Exit Ticket
1. Define 'molecule'. 2. What elements are in NaCl? 3. Draw a model of CO₂. 4. Is air a mixture or a compound? Why?
