Ключевые слова: 3d, actinides, alkali, atom, atomic, category, chemical, chemist, chemistry, colorful, conical, earth, education, element, experiment, gas, lab, laboratory, lanthanides, magnesium, material, medical, medicine, metalloids, model, molecule, nobel, nonmetallic, number, periodic, physics, pressure, properties, reaction, reagents, research, school, science, scientific, sign, solid, state, structure, study, symbol, table, teaching, technology, temperature,