Which pair of elements is most likely to chemically combine and form ionic bonds?
a)
chlorine and chlorine
b)
lithium and chlorine
c)
carbon and hydrogen
d)
sulfur and oxygen

The right answer for the question that is being asked and shown above is that: "C. carbon and hydrogen." The pair of elements is MOST likely to chemically combine and form ionic bonds are carbon and hydrogen 

Because a model would make the investigation easier to understand