Why do comets have different orbit lengths? Some comets travel much faster than others.
Some comet orbits are further away from the Sun than others.
Some comets are heavier than other taking longer to orbit.
Some comets have a much slower speed than others.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

it is the most commonly accepted one

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.