Define the term valence electron and explain how to find the number of valence electrons in family one and family 2.

Gymnast always perform on padded mats. how does the mats protect the gymnast

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

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