Which of the following would be expected to have the lowest first ionization energy?

Explanation:

o2- Due to lowest Zeff.

I had that question and my answer was this. because you did not put options.

answer; i believe the correct answer is (solid gold);

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.