Which of the following are likely to form an ionic bond?

copper atoms
hydrogen atoms
hydrogen and oxygen atoms
copper and fluorine atoms

Ionic bond is formed by metals and non metals so copper reacts with fluorine by donating 2 electrons to two fluorine atoms so as to gain an octet structure.
Cu + Fl₂→ CuFl₂
Cu²⁺ + Fl⁻→ CuFl₂
copper atoms have metallic bonds so also hydrogen atoms. while hydrogen and oxygen atoms have covalent bonds.

So3 that’s what i think

Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.