What is the oxidation number for S in the compound SO3? (Recall that O has an oxidation number of –2.) A. 0

+6

Explanation:

edge 2021!

im not exactly sure but i think its b!

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.