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.
1 If the half-life is known then the radioactivity of a source can be predicted in the future (see (1) above). 2  Plutonium-244 produced in the nuclear power industry has a half-life of 40 000 years!  Even after 80 000 years there is still a 1/4 of the dangerously radioactive material left.