Question

please answer all questions

Answer 1

1symbols are the short forms to represent elements they convey the message of that how many times the atom is that of carbon atom
3a . a chemical formula is the representation of a substance
3b . Its shows that it has three atoms of hydrogen and one atom of nitrogen 4a. The no. of atoms loosed or gained by an atom
5a some of the elements show more than one valency known as variable valance