What are two things that characterize the practice of science

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

Answer it is also known as the completion state is untrue of the activation complex;

Answerchemical energy;