Question

which element is the most reactive?

• sodium
• nickel
• carbon
• oxygen

Explanation:

Sodium is an alkali - metal. Alkali - metals are highly reactive as they have one valence electron and easily lose it to achieve a stable electron configuration. Nickel is a transition metal, carbon is a non - metal with moderate reactivity, and oxygen is a reactive non - metal but less reactive than sodium among these options in terms of losing or gaining electrons in common reactions.

Answer:

sodium