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. First, blended learning helps us have more control over our own learning. Learning materials are available at all times online. Students who are absent from school won’t miss lessons. Second, we can develop better communication and teamwork skills with blended learning. There are a lot of interesting learning activities giving us more flexibility to customize own learning experiences. This enables us to have more time for pairwork and group work. In short, it is undeniable that blended learning has crucial advantages including students’ control over their learning and soft skills development.

P(Z=15) có 5e hó trị 

=>cần 3e để đạt đuocẹ octet

H(Z=1) có 1e hóa trị 

=>cần 1e để đạt octet

vậy để hình thành iên kết PH3: Pgops chung 3e với 3e của 3H

=>trong PH3 xquanh P có 8e giống khí hiếm Ar còn 3 H đều có 2e giống khí hiếm He