If you have a ratio of 3 molecules methane per 4 molecules of oxygen, how many molecules of each product would be produced? 3CH4 + 402 --> C+ ___CO + _H20

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.