A 15.20 g of nitrogen will react with 17.37 g, 34.74 g, or 43.43 g of oxygen to form three different compounds.

a)Calculate the mass of oxygen per gram of nitrogen in each compound.

b) How do the numbers in part (a) support the atomic theory?

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.