If a barometer reads 535 mm Hg, what is the atmospheric pressure expressed in centimeters of mercury

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

you need to have a picture of the atom that way we can answer it