Question

this nonmetal gas that reacts easily with other elements is the only element that does not really fit anywhere in
oxygen
hydrogen
vanadium
chlorine

Explanation:

Hydrogen is a non - metal gas that reacts easily with other elements and is unique in the periodic table as it doesn't fit neatly into a single group like other elements. Oxygen is also reactive but has a defined group. Vanadium is a metal. Chlorine is reactive but has a more defined place in the halogen group.

Answer:

B. hydrogen