This article is about Aktinum. The longest half -life NP among Neptonium is short enough to be ignored compared to the age of crust.Thus, Neptunium is mainly made of intermediate products of the collapse of other isotopes, but the amount is small enough to ignore it.In 1942, the first natural plutonium was found in the uranium minerals, and the synthesis was first discovered and registered in the periodic table (no other isotopes of plutonium are not the most easily collected in this sample)..The longest isotope of plutonium is the isotopes, PU.The probability is 3 × 10^%.Plutonium is not found in the sample of the moon.Therefore, it does not exist much in nature, and most plutonium is mainly composed.
What is the longest half -life of Neptunium?
Np