Encyclopedia - Abundance Of The Chemical Elements: Encyclopedia - Abundance Of The Chemical Elements
The abundance of a chemical element measures how common the element is, or how much of the element there is. Abundance of the chemical el...   » Read the article

Encyclopedia - Radiometric Dating: Encyclopedia Ii - Radiometric Dating - Fundamentals Of Radiometric Dating
All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - Precautions
Radon is a carcinogenic gas. Radon is a radioactive material and must be handled with care at all times. It is hazardous to inhale this e...   » Read the article

Encyclopedia - Molten Salt Reactor: Encyclopedia Ii - Molten Salt Reactor - The Liquid Salt Very High Temperature Reactor
Research is currently picking up again for reactors that utilize molten salts for working fluids. Both the traditional molten salt reacto...   » Read the article

Encyclopedia - 91 Number: Encyclopedia Ii - 91 Number - In Mathematics
Ninety-one is a triangular number and a hexagonal number, one of the few such numbers to also be a centered hexagonal number, and it is a...   » Read the article

Encyclopedia - Thorium: Encyclopedia Ii - Thorium - Occurrence
Thorium is found in small amounts in most rocks and soils, where it is about three times more abundant than uranium, and is about as comm...   » Read the article

Encyclopedia - The Elements Song: Encyclopedia Ii - The Elements Song - Lyrics
There's antimony, arsenic, aluminum, selenium, And hydrogen and oxygen and nitrogen and rhenium, And nickel, neodymium, neptunium, german...   » Read the article

Encyclopedia - Neptunium: Encyclopedia Ii - Neptunium - Notable Characteristics
Silvery in appearance, neptunium metal is fairly chemically reactive and is found in at least three structural modifications: alpha-nept...   » Read the article

Encyclopedia - Abundance Of The Chemical Elements: Encyclopedia Ii - Abundance Of The Chemical Elements - Abundance Of Elements In Earth
Scientists believe that the Earth formed from the same cloud of matter that formed the Sun. Abundance of the chemical elements - Abundan...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - Occurrence
On average, there is one atom of radon in 1 x 1021 molecules of air. Radon can be found in some spring waters and hot springs. The towns ...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - Isotopes
There are twenty known isotopes of radon. The most stable isotope is radon-222, which is a decay product (daughter product) of radium-226...   » Read the article

Encyclopedia - Abundance Of The Chemical Elements: Encyclopedia Ii - Abundance Of The Chemical Elements - Abundance Of Elements In The Solar System
The Solar System was created from the remnants of previous stellar systems that went supernova, and is hence, relative to the rest of the...   » Read the article

Encyclopedia - Molten Salt Reactor: Encyclopedia Ii - Molten Salt Reactor - Fused Salt Selection
The types of fused salts that are chosen come from an optimization of salt characteristics. Fused fluorides are generally chosen over oth...   » Read the article

Encyclopedia - Abundance Of The Chemical Elements: Encyclopedia Ii - Abundance Of The Chemical Elements - Abundance Of Elements In The Universe
Hydrogen is the most abundant element in the known Universe; helium is second. However, after this, the rank of abundance does not contin...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - History
Radon (named for radium) was discovered in 1900 by Friedrich Ernst Dorn, who called it radium emanation. In 1908 William Ramsay and Rober...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - Notable Characteristics
Essentially chemically inert, but radioactive, radon is the heaviest noble gas and one of the heaviest gases at room temperature. (The he...   » Read the article

Encyclopedia - Thorium: Encyclopedia Ii - Thorium - Precautions
Powdered thorium metal is often pyrophoric and should be handled carefully. The thorium decay chain ends with an isotope of lead (208-Pb)...   » Read the article

Encyclopedia - Thorium: Encyclopedia Ii - Thorium - Isotopes
Naturally occurring thorium is composed of one isotope: 232-Th. twenty five radioisotopes have been characterized with the most {abundant...   » Read the article

Encyclopedia - Neptunium: Encyclopedia Ii - Neptunium - Isotopes
19 neptunium radioisotopes have been characterized, with the most stable being Np-237 with a half-life of 2.14 million years, Np-236 with...   » Read the article

Encyclopedia - Radiometric Dating: Encyclopedia Ii - Radiometric Dating - Modern Dating Techniques
Radiometric dating can be performed on samples as small as a billionth of a gram using a mass spectrometer. The mass spectrometer was inv...   » Read the article

Encyclopedia - Thorium: Encyclopedia Ii - Thorium - History
Thorium was discovered in 1828 by the Swedish chemist Jöns Jakob Berzelius, who named it after Thor, the Norse god of thunder. The metal...   » Read the article

Encyclopedia - Radiometric Dating: Encyclopedia Ii - Radiometric Dating - Short-range Dating Techniques
There are a number of other dating techniques that have short ranges and are so used for historical or archaeological studies. One of the...   » Read the article

Encyclopedia - Radon: Encyclopedia Ii - Radon - Applications
In the United States and Europe there are a few "radon spas," where people sit for minutes or hours in a high-radon atmosphere in the bel...   » Read the article