I have your class 9 chemistry and whoever is teaching atoms and molecules has not taught this properly in lecture 2 HE SAID ATOM or GROUP OF ATOMS which have net charge on them what does it mean to have charge and in lecture 1 he didnt start with law of conservation of mass law of chemical cobination law of constant proportion he directly jumped on table of elements and in lecture 2 he said that something (2,8,11) configuration and said you have never studied configuration then how did he say we have learnt configuration????????????? Please change the teacher??????? He’s not even aware of what topic to teach first i am not able to understand