Answered previously, though probably incorrectly. “Volatile” has subjective connotations. Most would say the elements in the periodic table with Lithium (sodium, potassium, cesium, et al.) would be most volatile, as in most reactive. But there are many other ways of looking at this; some would say oxygen might be most reactive because it combines readily with other elements – but by no means instantly, so other elements might be considered more active.
Chlorine, Fluorine, and others in group 17 of the periodic table might be most reactive, but most reactive and most volatile are not necessarily the same thing. Using volatle as “tendency to evaporate” would require specificity as to temperature and pressure as well. Many hydrocarbons are volatile but there are many other substances that, under various circumstances, might be more volatile.
A subjective question, with no definitive answer.
Volatile means tendency to vaporize — based on this standard definition, hydrogen and the noble gases are the most volatile elements. In standard english, volatility can also refer to reactivity — in that case, lithium and fluorine are both extremely reactive — likewise, because of the short length of their half-lifes, the manufactured elements (the ones that start with UU) can be considered volatile, in a sense, as well.
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