Science

1. Matter classification

1.1. Pure substance

1.1.1. Compound

1.1.1.1. A compound is a substance formed when two or more chemical elements are chemically bonded together.

1.1.2. Element

1.1.2.1. An element is a substance whose atoms all have the same number of protons.

1.1.2.1.1. They are organized in the periodic table

1.1.3. A pure substance is a material that has a constant composition (is homogeneous) and has consistent properties throughout the sample.

1.2. Mixtures

1.2.1. a substance made by mixing other substances together.