What is the state of oxygen at -200 degrees celsius

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

Each pair of clay balls represents to planetesimals if each plane test molluscum pound of the same material and is separated by the same distance which pair experiences the greatest gravitational attraction