You have made up a stock aqueous dye solution of known concentration equal to 500.0 parts per million (ppm) of green dye. If you take 2.0 mL of the stock solution and add 8.0 mL of water to it, what would the concentration of the diluted solution be in units of ppm?

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

i'm pretty sure its b i might be wrong though!

im not exactly sure but i think its b!