Study quantum mechanical scattering, t and r coefficients in 1-d

How are momentum and impulse related? impulse is a whim to do something, while momentum keeps it going impulse is another name fore instantaneous momentum the impulse acting on and object is equal to the change of momentum it causes. the impulse that acts on and object is the momentum that results.

Could someone me find the answer to this problem.

How many electrons does each element require in its valence shell to become stable?