The second Indrustrial revolution in the United States lasted from the

Light waves can move through , but they travel fastest when they move through a(n) .

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

Match each statement with the state of matter it describes