Ключевые слова: atom, atomic, atomic mass, background, basic, bond, chemical, chemistry, chemistry formula, component, concept, configuration, earth, education, electron, element, energy, environment, experiment, force, fundamental, laboratory, magnifying, mendeleev, metal, model, molecule, neutron, nuclear, periodic, periodic table, physics, polluted, power, quantum, radioactive, radioactivity, radon, radon atom, radon rn, radon symbol, risk, science, scientific, structure, symbol, technology, uranium,