Ineed someone who enjoys chemistry to me with an online class.

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

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