Bleaching powder was added to excess concentrated hydrochloric acid state whar was observed

Name the element in group 17, period 2. (periodic table)

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

How are the terms group and period used on the periodic table