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The alkaline earth metal strontium (38 Sr) has four stable, naturally occurring isotopes: 84 Sr (0.56%), 86 Sr (9.86%), 87 Sr (7.0%) and 88 Sr (82.58%). Its standard atomic weight is 87.62(1). Only 87 Sr is radiogenic ; it is produced by decay from the radioactive alkali metal 87 Rb , which has a half-life of 4.88 × 10 10 years (i.e. more than ...
Natural strontium is a mixture of four stable isotopes: 84 Sr, 86 Sr, 87 Sr, and 88 Sr. [11] On these isotopes, 88 Sr is the most abundant, makes up about 82.6% of all natural strontium, though the abundance varies due to the production of radiogenic 87 Sr as the daughter of long-lived beta-decaying 87 Rb. [22]
38 Si 25 37 Mg 38 Al 39 Si 26 37 Na 38 Mg 39 Al 40 Si 27 40 Al 41 Si 28 39 Na 40 Mg ... 84 Sr 85 Y 86 Zr 87 Nb 88 Mo 89 Tc 90 Ru 47 77 Zn. 78 Ga 79 Ge. 80 As 81 Se ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
The age of a sample is determined by analysing several minerals within multiple subsamples from different parts of the original sample. The 87 Sr/ 86 Sr ratio for each subsample is plotted against its 87 Rb/ 86 Sr ratio on a graph called an isochron. If these form a straight line then the subsamples are consistent, and the age probably reliable.
They considered elements 158 through 164 to be homologues of groups 4 through 10, and not 6 through 12, noting similarities of electron configurations to the period 5 transition metals (e.g. element 159 7d 4 9s 1 vs Nb 4d 4 5s 1, element 160 7d 5 9s 1 vs Mo 4d 5 5s 1, element 162 7d 7 9s 1 vs Ru 4d 7 5s 1, element 163 7d 8 9s 1 vs Rh 4d 8 5s 1 ...
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Rubidium-87 was the first and the most popular atom for making Bose–Einstein condensates in dilute atomic gases.Even though rubidium-85 is more abundant, rubidium-87 has a positive scattering length, which means it is mutually repulsive, at low temperatures.