The volume of a gas is 120L at 0.500atm and 15°c. what volume will it occupy at 0.250atm and 10°c

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?