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.
Urushiol is found in every part of the poison ivy plant throughout the year. This includes the leaf, the stem, the stalk and the roots. The oil can remain active on dead and dried plants for 2-5 years. Unwashed clothing can still deliver active urushiol a year or two later.