Question

Which of these elements does not exist as a diatomic molecule?
Ne, H, F, I

How do atoms acheive noble-gas configurations in single covailent bonds?
One atom completely loses two electrons to the other atom in the bond; Two atoms share two pairs of electrons; Two atoms share two electrons; Two atoms share one electron

Which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules?
unvalenced pair; outer pair; inner pair; unshared pair