The force of attraction that holds two atoms together is called a "chemical bond". true or false? if false, what is the right answer? in the "periodic table", dots around an element's symbol indicate the number of valence electrons in an atom. true or false? if false, what is the right answer?

Select the atomic models that belong to the same element

Which substances have the lowest melting points: ionic covalent, or metallic

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.