Why do elements in the same group or column of the periodic table have similar properties? a. they have the same number of protons. b. they have the same number of neutrons. c. they have the same number of outer shell electrons. d. they have the same number of electron shells.

Assume this car is driven off a cliff . how many arrows of force need to be drawn in the free body diagram? assume no air resistance -five -one -three -four

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?