An emission spectrum for an unknown element has one blue line and one green line against a black background.

Categorize them by metal, nonmetal, in periodic tableductilenon-ductilemalleableoften gain electrons easilygood conductorpoor conductorcan be liquidselements

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas