ORIGINAL AIRDATE: December 3rd, 1990 —
MacGyver visits a small town plagued by suspicious alien sightings and helps a struggling family
MISSION: After a close encounter with an alleged alien ship, MacGyver meets the child of a family seeking otherworldly assistance for their very real problems. He begins investigating the visitors and runs into trouble with the local law.
This week’s highlights include:
Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weakly radioactive because all its isotopes are unstable (with half-lives of the six naturally known isotopes, uranium-233 to uranium-238, varying between 69 years and 4.5 billion years). The most common isotopes in natural uranium are uranium-238 (which has 146 neutrons and accounts for over 99%) and uranium-235 (which has 143 neutrons). Uranium has the second highest atomic weight of the primordially occurring elements, lighter only than plutonium. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten. It occurs naturally in low concentrations of a few parts per million in soil, rock and water, and is commercially extracted from uranium-bearing minerals such as uraninite.
Check out the article on wikipedia: https://en.wikipedia.org/wiki/Uranium.