: Most of an atom's volume is actually empty space. If an atom were expanded to the size of a football stadium, the nucleus would be the size of a marble in the center, and the electrons would be like tiny gnats buzzing around the highest seats.
: This is the count of protons in the nucleus. For example, Hydrogen has 1 proton, while Gold has 79. : Most of an atom's volume is actually empty space
: Negatively charged particles that orbit the nucleus in specific regions called shells or orbitals. They are much smaller than protons and neutrons. Key Characteristics Hydrogen has 1 proton