Which of the elements listed below is most likely to exhibit an expanded octet in its compounds? o na c n s?

Among the elements listed below, Sulfur (S) is the one that is most likely to exhibit an expanded octet in its compounds. It is included in the exceptions in the Octet Rule. For example, SF6, the sulfur atom has 6 bonds connected to it. It has a total of 12 electrons surrounding it rather than 8 electrons only. 

Only one reactant yields 2 or more products. meaning you will only have 1 product and it will break down into 2 or more products. eg. h2o -> h2 + o2