For the reaction 2NO + O2 = 2NO2, what is the maximum amount of NO2 (46.0055 g/mol) which could be formed from 8.6g of NO (30.0061 g/mol) and 1.78g of O2 (31.9988 g/mom)?

there is none because earth is stationary and flat.

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.