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Carbon-11 or 11 C is a radioactive isotope of mass 11 of the element carbon, which has a half-life of about 20, 5 minutes decays to boron-11. The atomic nucleus of the nuclide is made up of 5 neutrons and the 6 element-specific protons.
Isotope data for carbon-11 in the Periodic Table. Click any isotope in diagram to see its data. Detailed decay information for the isotope carbon-11 including decay chains and daughter products.
Carbon-11 or 11 C is a radioactive isotope of carbon that decays to boron-11. This decay mainly occurs due to positron emission, with around 0.19–0.23% of decays instead occurring by electron capture. [6] [7] It has a half-life of 20.3402(53) min. 11 C → 11 B + e + + ν e + 0.96 MeV 11 C + e − → 11 B + ν e + 1.98 MeV
Summary. Lewis electron-dot symbols use dots to represent valence electrons around an atomic symbol. A Lewis electron dot diagram (or electron dot diagram or a Lewis diagram or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element.
Lewis symbols are diagrams that show the number of valence electrons of a particular element with dots that represent lone pairs. Lewis symbols do not visualize the electrons in the inner principal energy levels.
Electron dots are typically arranged in four pairs located on the four "sides" of the atomic symbol. Figure \(\PageIndex{1}\) : Lewis symbols illustrating the number of valence electrons for each element in the third period of the periodic table.
To write an element’s Lewis dot symbol, we place dots representing its valence electrons, one at a time, around the element’s chemical symbol. Up to four dots are placed above, below, to the left, and to the right of the symbol (in any order, as long as elements with four or fewer valence electrons have no more than one dot in each position).
