The formula of carbon tetrachloride is 

Atoms of same element or of different elements can join together to form 

It is  used to find out how the atoms of an element will combine with the atoms of another element to form a chemical compound.

Atoms of different elements join together in definite proportions to form molecules of 

The scientist who suggested that the symbols of elements be made from one or two letters to form the name of the element.

  The theory  based on the laws of chemical combination is

The mass of 0.5 mole of N₂ gas is 

A negatively charged ion is called an