H) In an experiment, a student counts 3.01 x 10^23 atoms of two different elements (A and B). Element A has a mass of 20.1 g and element B has a mass of 54.0 g.

i) If you had one atom of each, which would be the heaviest?

ii) How many moles of atoms were counted?

iii) Calculate the molar mass (g/mole) of each element.
iv) Using the periodic table, identify each element.

it's all four options.

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.