Which of the following is a covalent compound? *
CO2
OK20
O Naci
O MgCl2

Select the atomic models that belong to the same element

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

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.