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A great video lecture conducted by experienced chemistry teacher on 9th class chemistry chapter 1 topic atomic number and mass number. Get full understanding or ask any questions.

Atomic Number and Mass Number, ch 1, lec 1.2.1, Atomic Number and Mass Number - 9th Class Chemistry

12:38

Atomic number and mass number, ch 1, lec 1.2.1, Atomic Number and Mass Number - 9th Class Chemistry

40:10

Atomic number and mass number, ch 1, lec 1.2.1, Atomic Number and Mass Number - 9th Class Chemistry

33:45

Symbol and valency, ch 1, lec 1.2.1, Atomic Number and Mass Number - 9th Class Chemistry

35:09

Symbol and valency, ch 1, lec 1.2.1, Atomic Number and Mass Number - 9th Class Chemistry

33:48