Bitesize GCSE Chemistry: Atomic Structure and the Periodic Table

Atoms, Elements, and Compounds

Released On: 29 Feb 2024

Presenters: Dr. Sunayana Bhargava and Tulela Pea

Atom: The smallest unit of an element, retaining all chemical properties of that element.
Element: A pure substance made of only one type of atom. Examples include hydrogen, oxygen, and gold.
Compound: A substance formed when two or more different elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).
Mixture: A combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

Atoms are the basic building blocks of matter and consist of protons, neutrons, and electrons.
Elements are listed in the periodic table and can be metals, non-metals, or metalloids based on their properties.
Compounds have a fixed ratio of elements and exhibit properties different from their constituent elements.
Mixtures can be homogeneous (uniform composition, e.g., saltwater) or heterogeneous (non-uniform composition, e.g., salad).

The periodic table organizes elements based on atomic number and properties.
Understanding the difference between elements, compounds, and mixtures is crucial for studying chemical reactions and properties.

Focus on the definitions and examples of atoms, elements, and compounds.
Familiarize yourself with the periodic table's layout and learn to identify metals, non-metals, and metalloids.
Practice distinguishing between compounds and mixtures through examples and exercises.

This lecture is available for over a year and can be accessed for further review and study.