An interactive periodic table that shows which elements are most reactive — and why. Pick an element, compare two, or follow the trend.
Tap any element for details ↓
Less reactiveMore reactive
vs
Classic comparisons
Reactivity is shown on a qualitative 0–100 scale — there's no single physical constant for "reactivity," so the score is a composite of how aggressively each element reacts with common partners (water, oxygen, halogens) under standard conditions. Data drawn from Greenwood & Earnshaw's Chemistry of the Elements, the CRC Handbook, and the NIST Chemistry WebBook. Trans-actinides (Z ≥ 104) have predicted, not measured, chemistry.