Class-9-Science

Atoms and Molecules Theory Session-5

In this session atomic mass of elements its symbols and concept of molecular mass is discussed.

Atoms and Molecules Theory Session-6-Part-1

In this session teacher has discussed about - atoms and molecules. Ions – sodium cation – potassium cation – magnesium cation – calcium cation,  Anions, Ionic compounds, chemical formulae.

Atoms and Molecules Theory Session-6-Part-2

In this session teacher has discussed about - atoms and molecules. writing chemical formula of a molecular compound.