What is the most reactive element of group 16?

Oxygen

The correct answer is option 1. Oxygen.

Oxygen is a diatomic molecule, O₂, and it is highly reactive due to its strong tendency to gain electrons in chemical reactions. This reactivity is attributed to its electron configuration. Oxygen needs two more electrons to achieve a stable, noble gas configuration, similar to the noble gas neon. As a result, oxygen readily forms compounds with other elements by accepting electrons.

Oxygen is crucial for many life processes and is a key component in the Earth's atmosphere. It participates in various chemical reactions, such as combustion, respiration, and oxidation-reduction reactions. Its reactivity is essential for sustaining life and supporting diverse chemical processes on Earth.