HELP ASAPP PLSS A compound is made of 21.63% Magnesium, 21.39% Carbon, and 56.98% Oxygen. What is the empirical formula of the compound?

What is the correct lewis structure for chloroform chcl3

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.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?