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

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

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

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

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

Atoms, elements and compounds

Chemistry

In the Calculations involving mass unit, pupils will learn about calculating the relative formula mass of reactants and products in balanced chemical reactions, and the conservation of atoms and mass, as well as the concept of moles (HT only).

In the Patterns in the periodic table unit, pupils learnt how the chemical and physical properties of different elements are indicated by their position on the periodic table and about key groups of elements. 

Atomic structure and the periodic table

Which subatomic particles are the basic building blocks of atoms?

How do chemists communicate chemical compositions universally?

The smallest particle that everything is made up of.

Made of two or more different elements chemically bonded together.

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

Match the following terms with their definitions.

Hydrogen (H₂) is able to be described as ...

Everything around us is made of different combinations of {{}}, either on their own as elements, or in compound form.

anything that takes up space and has mass

Match the following elements with their correct atomic number (found on the periodic table).

Match the subatomic particles with their correct charge.

Where is the majority of an atom's mass located?

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

The term "nucleus" is used in multiple subjects but refers to different things. What does the nucleus refer to in chemistry?

Atoms, elements and compounds

Lesson outcome