Which combination of elements is most likely to undergo a chemical reaction based on their positions in the Periodic Table of the Elements?

Question

Quizplus · Accepted Answer

Na (Sodium) and Cl (Chlorine) are highly reactive with each other because Na is a highly reactive metal and Cl is a highly reactive non-metal. Sodium tends to lose an electron to form a positive ion, while Chlorine tends to gain an electron to form a negative ion, making them likely to form an ionic compound (NaCl, table salt).

Which Combination of Elements Is Most Likely to Undergo a Chemical