Which is most likely to get hot faster when touching a warm surface

How have the greenhouse gasses increased from the year 2000 to 2018

Select all of the statements which are true. electrons are located in shells or orbits around the atom. electrons orbit slowly around the atom. electrons travel in one flat path around the nucleus of an atom. the valence of an atom is determined by the number of electrons in the atom's outermost shell.

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