What does it mean if elements are in the same group on the 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

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

What state of matter is ice a. liquid b. element c. solid d. gas