If these minerals crystallized from the same silicic melt, each mineral had the same initial 87Sr/86Sr as the parent melt. However, because Rb substitutes for K in minerals and these minerals have different K/Ca ratios, the minerals will have had different Rb/Sr ratios.
What is the half-life of rubidium strontium?
48.8 billion years RADIOMETRIC TIME SCALEParent IsotopeStable Daughter ProductCurrently Accepted Half-Life ValuesThorium-232Lead-20814.0 billion yearsRubidium-87Strontium-8748.8 billion yearsPotassium-40Argon-401.25 billion yearsSamarium-147Neodymium-143106 billion years2 more rows•13 Jun 2001
The utility of the rubidium–strontium isotope system results from the fact that 87Rb (one of two naturally occurring isotopes of rubidium) decays to 87Sr with a half-life of 49.23 billion years. If these minerals crystallized from the same silicic melt, each mineral had the same initial 87Sr/86Sr as the parent melt.
Is rubidium more reactive than potassium?
4883 Rubidium Rubidium is a typical but very reactive member of the series of alkali metals. It is appreciably more reactive than potassium, but less so than caesium, and so would be expected to react more violently with those materials that are hazardous with potassium or sodium.
How is Rubidium 87 used?
The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87Rb) and strontium (87Sr, 86Sr). As a result, Rb is enriched in crustal rocks.
What is SI unit of decay constant?
s-1 Probability of a given nucleus in a particular energy state undergoing a spontaneous nuclear transition from that energy state in a unit time interval. The SI unit of decay constant is s-1.
Where is cesium used?
The most common use for caesium compounds is as a drilling fluid. They are also used to make special optical glass, as a catalyst promoter, in vacuum tubes and in radiation monitoring equipment. One of its most important uses is in the caesium clock (atomic clock).
Is CS more reactive than K?
Potassium is more reactive than Sodium and Lithium because Potassium is bigger than them. So the ionization energy in K is less than that in Na or in Li. So Potassium is more reactive than many other metals. However, Rubidium Rb and Cesium Cs are more reactive than Potassium.