Which compounds have double or triple bonds? • N2 • CCl4 • SiO2 • AlCl3 • CaCl2 • LiBr

the dissolution of polymer can be thermodynamically described in 2 steps.

i think it's letter a.

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.