How many atoms of nitrogen are in 10 g of NH4NO3?
(Avogadro's number = 6.022 x1023), (
Molar mass NH4NO3 = 80.04 g/mol)
Select one:
O A. 1.5 x 1023
O B. 3.0 x 1023
O C. 1.8
O D. 2.3 x 1023

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.