What periodic element has no luster and is very active chemically?

Question

What periodic element has no luster and is very active chemically?

Answer 1

Flourine

Answer 2

When you talk about luster, you are normally talking about a solid; not a gas or liquid. The most reactive solid is Fr (francium); the most common of the ilk are lithium, sodium, potassium, and cesium. All have one electron, easily lost. Fr + F2 is REAL reactive!