The name Dinitrogen tetroxide tells you that the compound contains two nitrogen atoms and four oxygen atoms.
a chemical formula
Hydrogen atoms
It tells you what type of bonding whether; Ionic, Metallic, Covalent Network or Molecular Covalent. It tells you the elements that make up the compound. It also tells you the stage of matter; solid, liquid or gas. And since you known the elements you can find out really anything you want to know about it like; # of protons, # of neutrons, mass number, atomic weight, reactivity, etc.
It tells what elements are in a compound and the number of each type of atom in each molecule/formula unit.
The chemical composition of the compound
The formula contains the chemical symbols and tells us what the elements are. As an example Calcium Carbonate is CaCO3 and shows that Calcium, Carbon and Oxygen are present.
This formula tells you that the compound has one atom of the element Barium and two atoms of the element Fluorine. It is called Barium Fluoride.
The letters are the symbols of elements and ions that are contained in the compound. For example H2O tells us that the molecule (water) contains two atoms of hydrogen and one of oxygen. The compound water can be broken down into its separate elements in several ways.
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it tells you the direction of the magnetic compound
The percent composition of a compound tells the amount of each element in the compound as a percentage. It is possible to find if the mass of an element and the total mass of the compound is known.
A chemical formula tells what elements make up a compound and the exact number of atoms of each element in a unit of compound. :)