Blended learning offers a fllexible approach to education by combining the advantages of both online and in-person learning. ne key benefit is increased accessibility, as a student can access materials and participate in learning activities from anywhere with an internet connection, accommodating different schedules and learning paces. Moreover, it promotes a more personalized learning experience, allowing students to revisit online content as needed and engage in face-to-face interactions for clarification and deeper understanding. This combine can lead to enhanced engagement and motivation, as students can benefit from varied teaching methods and resourses. Furthermore, blended learning can foster better digital literacy skills,preparing students for a technology-driven world while still valuing social interaction and immediate feedback available in a traditional classroom

P(Z=15): 1s² 2s² 2p⁶ 3s² 3p² 3p³⇒P có 5 electron hóa trị cần thêm 3 electron để  đạt octet 

H(Z=1): 1s¹⇒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 khi hiếm Ar còn 3 H đều có 2 electron giống khi hiếm He