If an atom is not oxidized or reduced during a redox reaction the does not change

Find the protons, electrons and neutrons for strontium with a mass of 83

Endeleev saw trends in the physical and chemical properties of elements when he organized them by

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.