Chemistry 9th Class Guess

Guess Chemistry 9th
Branches of chem, valency, how to write chemical formula, significance of chem formula, molecular ion, free radical, Avogadro's no, mole, properties of cathode and anode rays, Bohr's atomic model, isotopes of C, Cl, hydrogen, & uses, periodic table, electromagnetically, shielding effect, covalent bond & types, properties & nature of chemical bond, hydrogen bonding,
laws