What are atoms? Give examples of substances made of atoms.

Atoms are tiny, chemically indivisible particles.
Helium, neon, argon, diamond, graphite, iron, aluminum, ruby, silicon and others.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.