The first four planets in our solar system are rocky. how does that relate to newton’s law of universal gravitation?

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

it is stable as it is in group 0 which have full outer shells of electrons

the answer is c.the valence of the atoms combine .