Blended learning, which combines traditional face-to-face instruction with online educational tools, offers numerous benefits for both students and educators. One key advantage is its flexibility, allowing learners to access materials and complete tasks at their own pace, catering to diverse learning styles and individual needs. By incorporating digital resources such as videos, interactive quizzes, and discussion forums, blended learning enhances engagement and fosters a deeper understanding of topics. It also encourages self-directed learning, helping students build critical skills such as time management and independence. For educators, this approach provides valuable opportunities to track student progress through online assessments, enabling more personalized feedback and targeted support. Additionally, blended learning can bridge geographical barriers, making education accessible to a wider audience. Ultimately, it creates a dynamic and adaptable learning environment that prepares students for a technology-driven world while improving overall educational outcomes.

P (Z = 15): 1s22s22p63s23p3 Þ P có 5 electron hóa trị cần thêm 3 electron để đạt octet.

H (Z = 1): 1s1 Þ H có 1 electron hóa trị cần thêm 1 electron để đạt octet.

Khi hình thành liên kết, P góp chung 3 electron với 3 electron của 3 H ⇒ Trong PH3, xung quanh P có 8 electron giống khí hiếm Ar còn 3 H đều có 2 electron giống khí hiếm He.