During the chemical evolution of life, in the early atmosphere of earth, the most active light element was ____.

Step-by-step solution

During the chemical evolution of life, the early atmosphere of Earth was highly reducing. Hydrogen was the most abundant and active light element. It readily reacted with other available elements such as carbon, nitrogen, and oxygen to form stable molecules like methane ( CH₄ ), ammonia ( NH₃ ), and water vapor ( H₂O ). Answer: hydrogen