How to draw dot and cross diagram of methane

How to draw dot and cross diagram of Hydrogen molecule

How to draw dot and cross diagram of Oxygen molecule

How to draw dot and cross diagram of carbon dioxide 

How to draw dot and cross diagram of Water molecule

How to draw dot and cross diagram of sodium chloride ionic compound

How to draw dot and cross diagram of magnesium chloride ionic compound

How to draw dot and cross diagram of calcium oxide ionic compound

How to draw dot and cross diagram of sodium oxide ionic compound

Why do atoms form bonds| Ionic bond and covalent bond

Mole Calculation| Four methods to calculate mole