Strontium Sr , chemical element , one of the alkaline-earth metals of Group 2 IIa of the periodic table. It is used as an ingredient in red signal flares and phosphors and is the principal health hazard in radioactive fallout. Strontium is a soft metal like lead and, when freshly cut, has a silvery lustre. It rapidly reacts in air to take on a yellowish colour; therefore, it must be protected from oxygen for storage. It does not occur free in nature. Although it is widely distributed with calcium , there are only two principal ores of strontium alone, celestine SrSO 4 and strontianite SrCO 3.
Which radioactive isotope is used in geological dating?
Which radioactive isotope is used in geological dating? | Yahoo Answers
Since we cannot travel back in time to measure temperatures and other environmental conditions, we must rely on proxies for these conditions locked up in ancient geological materials. The most widely applied proxy in studying past climate change are the isotopes of the element oxygen. Isotopes refer to different elemental atomic configurations that have a variable number of neutrons neutrally charged particles but the same number of protons positive charges and electrons negative charges. As you might remember from your chemistry classes, protons and neutrons have equivalent masses, whereas electrons are weightless.
Uranium—lead dating , abbreviated U—Pb dating , is one of the oldest  and most refined of the radiometric dating schemes. It can be used to date rocks that formed and crystallised from about 1 million years to over 4. The method is usually applied to zircon. This mineral incorporates uranium and thorium atoms into its crystal structure , but strongly rejects lead when forming.
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