What do the little numbers (superscripts) at the top represent? 1 word

What three things does a balanced equation show you?

The diagin dilutepage 6 of 12a6a5(a)fluorine, chlorine, bromine and iodine are placed in the same group of theperiodic table. state the common name used to describe elements in this group.(i)state the group in which the elements are placed and explain whythey are placed in that group.(ii)which of the above named elements is a solid at roomtemperature and pressure?

What lessons does the history and study of the periodic table offer to other fields of science, and the pursuit science more generally