What does the atomic number of an atom tell you ?

Hello there!

The atomic number of an atom tells you an element's identity, and informs you of how many protons are present in the nucleus of the atom. 

For example;
Potassium is an element with the symbol "K" on the periodic table that belongs in the Alkali Metal group, and has an atomic number of 19. This means that Potassium has 19 protons. 

I hope this helps!

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.