Sunidhi made a study chart about changes in states of matter. which headings best complete the chart? x: solid directly to liquid y: liquid directly to solid x: liquid directly to solid y: solid directly to liquid x: heat is released y: heat is absorbed x: heat is absorbed y: heat is released

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.  

c. 4.54 x 10–12 j happens to be correct