Non-metal elements are those in the periodic table excluding metals and metalloids, with lower melting points, boiling points, and electrical conductivity, and are mostly gaseous or solid. They play an important role in life and industry, such as oxygen for breathing, hydrogen for energy, and carbon for manufacturing graphite and diamonds.

This mind map comprehensively presents three fundamental scientific concepts: "definition, examples, physical properties". In the "definition" section, it clarifies the meanings and scopes of terms; "examples" provides concrete instances for deeper understanding; "physical properties" explores the physical characteristics of substances and their measurement methods. These lay a solid foundation for understanding scientific phenomena.