half-life exchange
51Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …
52Heroin — Not to be confused with heroine. For other uses, see Heroin (disambiguation). Heroin …
53Uranium — (pronEng|jʊˈreɪniəm) is a silvery gray metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 protons and 92 electrons, 6 of them valence electrons. It can have between 141 and …
54Decompression (diving) — Divers decompressing in the water at the end of a dive Decompression in the context of diving derives from the reduction in ambient pressure experienced by the diver during the ascent at the end of a dive or hyperbaric exposure and refers to both …
55Portal (video game) — Portal Portal s box art displays a figure moving into a portal. Signs of this style are commonly used in the game s environment. Developer(s) …
56Thulium — (pronEng|ˈθjuːliəm) is a chemical element that has the symbol Tm and atomic number 69. A lanthanide element, thulium is the least abundant of the rare earths. It is an easily workable metal with a bright silvery gray luster and can be cut by a… …
57Ytterbium — Yb redirects here. For the unit of information, see Yottabit. thulium ← ytterbium → lutetium ↑ Yb ↓ No …
58GLaDOS — GLaDOS, as she appears in Portal 2 Series Portal First game Portal (2007) Created by Erik Wolpaw Kim Swift …
59Europium — (pronEng|jʊˈroʊpiəm) is a chemical element with the symbol Eu and atomic number 63. It was named after the continent Europe. Characteristics Europium is the most reactive of the rare earth elements; it rapidly oxidizes in air, and resembles… …
60Samarium — promethium ← samarium → europium ↑ Sm ↓ …
