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The 6 Li isotope is one of only five stable nuclides to have both an odd number of protons and an odd number of neutrons, the other four stable odd-odd nuclides being hydrogen-2, boron-10, nitrogen-14, and tantalum-180m. [27] 7 Li is one of the primordial elements (or, more properly, primordial nuclides) produced in Big Bang nucleosynthesis.
Graphene (/ ˈ ɡ r æ f iː n /) [1] is a carbon allotrope consisting of a single layer of atoms arranged in a honeycomb planar nanostructure. [2] [3] The name "graphene" is derived from "graphite" and the suffix -ene, indicating the presence of double bonds within the carbon structure.
Naturally occurring vanadium is composed of one stable isotope, 51 V, and one radioactive isotope, 50 V. The latter has a half-life of 2.71×10 17 years and a natural abundance of 0.25%. 51 V has a nuclear spin of 7 ⁄ 2 , which is useful for NMR spectroscopy . [ 25 ]