The best and most correct answer among the choices provided by your question is the fourth choice.
Chlorine and sodium are most likely to form monatomic ions.
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By using common factors of physics: weight, gravity, and stability.
Weight would keep them at a constant height.
Gravity helps the weight and how much force it propels the person, or objects, into the air.
Stability helps adjust how much distance the person, or object, needs to be.