. If 24 grams of sodium chloride (NaCl) (molar mass: 58.45 g/mol) reacts with an excess amount of magnesium oxide, how many grams of sodium oxide (Na20) (molar mass-61.995 g/mol) will be produced?

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.