The atomic number of an atom is always equal to the total number of neutrons in the nucleus
neutrons plus protons in the atom
protons in the nucleus
protons plus electrons in the atom

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

Why is the melting of ice a physical change ?

Light waves are as they pass through the