Why do atoms form bonds by donating, accepting or sharing electrons with other atoms? A. Bonding breaks an atom into stable parts.
B. Bonding gives an atom the same number of electrons as a noble gas.
C. Bonding gives an atom the same number of protons as a noble gas.
D. Bonding changes all atoms into ions.

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?