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- n. The major stable isotope of silicon, 2814Si, having fourteen protons and fourteen neutrons; it amounts to over 92% of the element in nature
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A team of scientists based in Germany measured the constant by counting the atoms in a painstakingly crafted one-kilogram sphere of silicon-28.
To conduct their experiments, they have been working with individual spins of electrons of phosphorus-31 atoms contained in a very expensive, exceptionally pure and isotopically controlled silicon-28 crystal, Lyon said.
However, it requires almost completely pure silicon-28, and that is a product which is extremely difficult to produce in any large quantity.