Kindergarten Number Sense Worksheets. Music Meets Math Worksheets 1-2 - Students will color one-five instruments in a set and practice printing the names of the instruments. This worksheet reinforces instrument recognition, counting to five, vocabulary, and handwriting.
Plutonium (IPA: /ËpluËËtÉÊniÉm/) is a radioactive, metallic chemical element. It has the symbol Pu and the atomic number 94. It is the element used in most modern nuclear weapons. The most significant isotope of plutonium is 239Pu, with a half-life of 24,100 years. It can be made from natural uranium and is fissile.
Both neptunium and plutonium can be detected in uranium minerals, though the amounts are small. Uranium minerals regularly contain 1.8 microgrammes of neptunium and up to 0.15 microgrammes of plutonium per ton uranium. In addition there is also primeval plutonium on Earth. The isotope 244 has a half-life of 82.6 million years, and this is enough that a minute amount has survived since the elements making up the Earth were created in the last supernova event before the birth of the solar system.