What element is in group 1 peroid 6

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

The excretory system,need answers for all: )

Which sample at stp has the same number of atoms as 18 liters of ne at stp