What is the smallest particle of matter?
Atoms are the smallest building block of matter. Each atom has a nucleus made up of protons and neutrons, and electrons orbiting the nucleus. Atoms combine to form molecules, which make up all living things, including plants, animals, and humans. Atoms can join together to create molecules with different properties, like water, oxygen, and carbon dioxide.
Atoms: The Building Blocks of Life
Atom: An atom is the smallest unit of matter that still retains its chemical properties. Atoms are made up of protons, neutrons, and electrons. Molecule: A molecule is a group of atoms held together by chemical bonds. Molecules can be made up of one type of atom or a combination of different atoms. Ion: An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
Atoms are so small that it would take about 250,000 of them lined up in a row to measure one inch. Atoms are made up of protons, neutrons, and electrons. All three of these subatomic particles have mass, but the mass of the protons and neutrons together is about 1,836 times greater than the mass of the electrons. Atoms are always in motion, vibrating and spinning even when they are part of a solid object.
Did you know?
What do you think are the biggest differences between a monatomic atom and a diatomic atom?
What does the periodic table tell us about the elements?
How do the atomic number and mass number of an element relate to the number of protons, neutrons and electrons?
What patterns do you notice when looking at the periodic table, such as the arrangement of elements into periods and groups?
Brain break: Draw a dinosaur making a cake with a small chef's hat on its head
Question: What is the smallest unit of an element? Clues: • Atoms are composed of protons, neutrons and electrons. • Atoms can combine to form molecules. • Atoms of an element are all the same. In pairs: Select and solve one of the tasks: A. In pairs, draw a diagram to show how atoms of an element come together to form a molecule. B. In pairs, write a short explanation of how atoms of an element differ from atoms of another element.
What is the smallest particle of an element that retains its identity in a chemical reaction?
Who is credited with the discovery of the electron in 1897?
- Marie Curie
- J.J. Thomson
- Ernest Rutherford
What is the atomic number of carbon?
Which subatomic particles are located inside the nucleus of an atom?
- Neutrons and electrons
- Protons and neutrons
- Electrons and protons
What type(s) of charge can be found on subatomic particles?
- Only positive charges
- Only negative charges
- Positive, negative, or neutral charges
Work together in pairs: What is the smallest particle of an element that still has the properties of that element?