P(Z=15):1s22s22p63s23p3

H(Z=1):1s1

Để P đạt đc cấu hình bền vững thì cần thêm 3 e

Để H đạt đc cấu hình bền vững thì cần thêm 1 e

Khi hình thành liên kết Octet, P góp chung 3 e với 3e của H

=> Trong PH3 xung quanh có 8 e giống khí hiếm của Ar và 3 H đều có 2e giống khí hiếm He

   **

H:P:H

   **

   H

There are three things we can do to improve the environment in our school. First, we can  clean up all areas regularly.For example we can organise clean up activities at weekends.By doing this, we can keep our environment clean, beautiful, and safe for everyone. Second, we should plant more trees or flowers in the street or students can plant trees in their school.By doing this,we can reduces carbon footprint and makes the air clean for the environment.Finally, we should set up more rubbish bins.We cần put more rubbish bins in public places such as park or bus stations.By doing this, helping us keeps the environment clean and makes it safe for everyone.

In conclusion, we can improve the environment in our school in many ways and even small actions cần make a big difference.