P có 5 electron hóa trị cần thêm 3 electron để đạt octet.

 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

Blended learning is a way of studying a subject, which combines learning over the Internet and face-to-face learning, and brings several benefits to us. Firstly, blended learning helps us have more control over our own learning. We are able to get access to many online materials and video lectures at any time. This also allows us to watch and review lessons that we have not understood at home. If we are absent from school, we will not miss any lessons. Secondly, we can develop better communication and teamwork skills in a blended learning class. Since a lot of the work is assigned for homework, we have more time for pair work and group work in the classroom. Unlike traditional learning, blended learning provides us with more ways of communication including text messages, emails or social media. In conclusion, I think we should have more blended learning classes at school because they keep us engaged and helps us learn useful skills.