the 3 things i have learnt in todays lesson is :

1st. the naming of binary compounds. i have never learnt that in my secondary school. the web sites teaches me the steps to name ,what we should avoid, and when and where to add things like '-iode'.

2nd. i have learnt the prefix. from 1 to 10. things like this is not something my secondary school will teach as we were normally test only till di or most tri.

3rd.i have learnt about polyatomic anions. before this lesson, i only learnt about anions and cations. anything with positive charge will be cation. anything that with negative charge is anions. so polyatomici ions is somthing that is new