Europium is the most active of the lanthanides. It is more likely to react with other elements than the other rare earth elements. Europium is quite expensive to produce, so it has few practical uses.It is used in television tubes and lasers.uropium is the most active of the lanthanides. It is more likely to react with other elements than the other rare earth elements. Europium is quite expensive to produce, so it has few practical uses.
A poisonous plant rash typically persists for 10 to 14 days. Longevity of the allergic reaction varies for each person, however, and can be longer. If symptoms last longer than a few weeks, consult a physician.
If you developed a rash 12 to 72 hours after brushing up against a leafy plant, you could have come in contact with poison oak, poison ivy, or poison sumac. Rashes caused by such a plant will only respond to a medicated prescription.