How many atoms are in 3.50 moles of calcium (ca)?

How are ionic bonds formed and what is the attractive force within an ionic bond

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

Define a is a tiny pavket of energy