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Year 10
OCR
Foundation

Atoms, elements and compounds (mass number to 1 d.p.)

I can describe elements as being made up of only one type of atom, and that elements can combine chemically to form compounds.

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New
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Year 10
OCR
Foundation

Atoms, elements and compounds (mass number to 1 d.p.)

I can describe elements as being made up of only one type of atom, and that elements can combine chemically to form compounds.

Download all resources
Share activities with pupils

Lesson details

Key learning points

  1. Atoms of every element consist of the same three subatomic particles.
  2. All elements consist of their own atoms, with a unique number of protons defining the element.
  3. Everything around us is made of different combinations of atoms, either on their own, or in compound form.
  4. We use element symbols in formulae as a common language to share chemical compositions.

Common misconception

Students often think that an elemental diatomic molecule, e.g. hydrogen, is a compound because they see two atoms chemically joined together.

The teacher needs to emphasise the definition for compounds. Molecules are not the same as compounds, some molecules are compounds, not all.

Keywords

  • Atom - An atom is the smallest particle that everything is made up of.

  • Element - An element is made up of only one type of atom, a list of elements can be found on the periodic table.

  • Compound - A compound is made of of two or more different elements chemically bonded together.

  • Chemical formula - The chemical formula of a molecule is a shorthand way of listing the type and number of atoms in a compound.

  • Chemical composition - The chemical composition tells you the different types of atoms in a chemical.

Use molecular models to make up molecules of elements and compounds and practice writing formulae from these models.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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Starter quiz

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6 Questions

Q1.
What is matter?
Correct answer: anything that takes up space and has mass
only liquids and solids
only gases
energy
Q2.
Match the following elements with their correct atomic number (found on the periodic table).
Correct Answer:Chlorine,17

17

Correct Answer:Neon,10

10

Correct Answer:Iron,26

26

Correct Answer:Sodium,11

11

Q3.
Melting ice is an example of a ...
chemical change.
Correct answer: physical change.
both a physical and chemical change.
Neither a physical nor chemical change.
Q4.
Match the subatomic particles with their correct charge.
Correct Answer:Proton,Positive

Positive

Correct Answer:Neutron,Neutral

Neutral

Correct Answer:Electron, Negative

Negative

Q5.
Where is the majority of an atom's mass located?
in the electrons
Correct answer: in the nucleus
evenly distributed throughout the atom
Q6.
The term "nucleus" is used in multiple subjects but refers to different things. What does the nucleus refer to in chemistry?
Correct answer: The centre of an atom, containing protons and neutrons.
The part of a cell that contains genetic material.
A cluster of neuronal cell bodies within the brain.
A dense cluster of stars or galaxies, especially at the centre of a galaxy.

Exit quiz

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6 Questions

Q1.
Which subatomic particles are the basic building blocks of atoms?
Electrons only.
Protons only.
Protons and neutrons.
Correct answer: Protons, neutrons and electrons.
None of these.
Q2.
What defines an element?
Correct answer: The number of protons.
The number of electrons.
The number of neutrons.
The number of molecules.
Q3.
How do chemists communicate chemical compositions universally?
Through detailed descriptions.
Correct answer: By using element symbols in formulae.
With full chemical names.
Q4.
Match the following terms with their definitions.
Correct Answer:Atom,The smallest particle that everything is made up of.

The smallest particle that everything is made up of.

Correct Answer:Element,Made up of only one type of atom.

Made up of only one type of atom.

Correct Answer:Compound,Made of two or more different elements chemically bonded together.

Made of two or more different elements chemically bonded together.

Correct Answer:Chemical formula,A shorthand way of listing the type and number of atoms in a compound.

A shorthand way of listing the type and number of atoms in a compound.

Q5.
Hydrogen (H₂) is able to be described as:
a compound
Correct answer: an element
a mixture
Correct answer: a molecule
Q6.
Everything around us is made of different combinations of , either on their own as elements, or in compound form.
Correct Answer: atoms