Final answer:
Chlorine is the element with the most valence electrons able to react with hydrogen, forming compounds like hydrogen chloride (HCl).
Explanation:
The element with the most valence electrons able to react with hydrogen is chlorine. Hydrogen forms compounds with elements that are more electronegative, such as halogens like chlorine. When hydrogen is bonded to chlorine, it takes on a partial positive charge, enabling the formation of compounds like hydrogen chloride (HCl).
Learn more about Hydrogen and element interactions here:
https://brainly.com/question/37974134
