Which one of these chemical equations has a molar ratio with the smallest difference between elemental sodium (Na) as a reactant and the chemical formed as a product.

the answer is 0.42 is that is an option. this question provides no info

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.