Which statement best explains why radon and krypton do not bond easily with other elements? O. They have many electron shells, so their protons do not attract electrons strongly.
O They have eight electrons in their valence shells, so they are stable without gaining or losing electrons.
O Their valence shells are empty, so they do not need to bond with other elements to be more stable.
O Their valence shells are so close to the protons in the nucleus that bonding cannot happen like in other elements.​

The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)

Which composition of water moves to begin a deepwater current?

Describe the three ray tracing steps used to identify an image for the given situation.