What is the number of electronsin hydrogen?

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

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

In a ball-and-stick molecular model, what do the sticks represent?