How are living things organized into domains and kingdoms check all that apply

When a scientific theory has been tested and proved by the scientific community, it becomes a law

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?