I believe it is C, as helium is one of the lightest noble gases making the particles move faster.
Explanation:
Atoms of metals do not hold their electrons to themselves. Instead they allow them to float around them delocalised. This is important because it is this characteristic that allows metals to be good conductors of electricity since electrons are free to move around to carry a charge.
please mark it brainliest
The answer for this is 26.6°c
