Atoms of which two elements will form an ionic bond? a. N and O
b. Mg and Cl
c. Fe and Co
d. Rb and Al

it's filtration, but this is an assumption so my apologies if i got this

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.