What is P2? Important knowledge about P2

Provide 5 examples [if any]

5. Application of P₂
   5.1 In daily life
   5.2 In industry
   5.3 In scientific research

6. Review exercise
   Select 5 questions related to P₂ for students to review and understand better.

7. Conclusion
   Summarize about P₂ and the importance of understanding P₂ in learning and life.

Note: The P₂ referred here is red phosphorus, a chemical compound of the element phosphorus. Red phosphorus can exist in the form of P₄ or P₂, but under normal conditions, it usually exists in the form of P₄.