An electrically neutral atom of beryllium has four protons.
which statement is true?
-there are four neutrons in the nucleus. -there is a charge of +4 on an atom of beryllium. -there is a charge of -4 on an atom of beryllium. -there are four electrons.

What three things determine the shape and size of a puddle when water is poured out onto a surface

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory

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