Which category of elements on the periodic table tends to create negative charged ions

How many grams of n2h4 will be consumed by 23 g of n2o4

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

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.