A formula unit is defined as the lowest whole number ratio of the ions present in an ionic compound. The formula unit of an
ionic compound is always an empirical formula.
What is the formula unit of barium fluoride?

Diffraction is when light is bent around obstructions. which of the these observation about clouds would indicate diffraction? a) after rain storms, you can sometimes see rainbows. b) clouds are white or gray and cannot be seen through. c) on a cloudy day, the temperature tends to be cooler than a sunny day. d) the edges of dark clouds appear lighter. this