How would you expect the reaction profile of an endothermic reaction to look? a. The reactants have more energy than the products.
b. The products have more energy than the reactants.
c. There is no activation energy.
d. The reactants and the products have the same energy.

B. the products have more energy than the reactants.

the increase of protons   hope 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.