Summary
Highlights
The video starts by introducing matter as anything with mass and takes up space, giving examples like stars, planets, dogs, and rubber duckies. It then states that most matter in the universe is made up of atoms. An element is defined as a substance made of only one kind of atom, found on the periodic table.
Atoms are composed of smaller subatomic particles. In the nucleus (the center of an atom), there are protons and neutrons. Protons are positively charged particles, and their number defines an element, known as the atomic number. Each element has a unique atomic number. Neutrons are uncharged particles also found in the nucleus.
Orbiting the nucleus is a cloud of negatively charged particles called electrons. Electrons are significantly smaller in mass compared to protons and neutrons. The overall mass of an atom is determined by the sum of the mass of its protons and neutrons.