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Matter makes up all substances that have a mass and occupy space.
Matter is made up of particles. Here are four ways of describing particles, according to their structure.
An atom is a particle of matter invisible to the naked eye. It is the building unit of molecules and compounds in general.
An element is a particle made up of only one type of atom.
A compound is a particle made up of several types of chemically bonded atoms.
A molecule is a particle made up of at least two non-metals chemically bonded together.
The atom can be represented using the following models:
Since atoms, molecules and compounds are present in substances in very large quantities, we use moles to count them and molar mass to measure their mass.
The periodic table organizes all the chemical elements. They are classified according to the composition of their nucleus, their electron configuration and their properties.
To find out more about the periodic table, check out the following concept sheets:
A solution is a homogeneous mixture in which one substance, called the solute, is dissolved in another, called the solvent.
To find out more about solutions, check out the following concept sheets: