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  2. List of chemical elements - Wikipedia

    en.wikipedia.org/wiki/List_of_chemical_elements

    A chemical element, ... is a type of atom which has a specific number of protons in its atomic nucleus ... Neon [u] 18 2 p-block 20.180: 0.000 9002: 24.56:

  3. Neon - Wikipedia

    en.wikipedia.org/wiki/Neon

    This is an accepted version of this page This is the latest accepted revision, reviewed on 25 January 2025. Chemical element with atomic number 10 (Ne) This article is about the chemical element. For other uses, see Neon (disambiguation). Chemical element with atomic number 10 (Ne) Neon, 10 Ne Neon Appearance colorless gas exhibiting an orange-red glow when placed in an electric field Standard ...

  4. Periodic table - Wikipedia

    en.wikipedia.org/wiki/Periodic_table

    Neon 10 Ne 20.180: 3: So­dium 11 ... all of its atoms have six protons and most have six neutrons as well, but about one per cent have seven neutrons, and a very ...

  5. Isotopes of neon - Wikipedia

    en.wikipedia.org/wiki/Isotopes_of_neon

    The abundances of the naturally occurring isotopes of neon. Neon (10 Ne) possesses three stable isotopes: 20 Ne, 21 Ne, and 22 Ne. In addition, 17 radioactive isotopes have been discovered, ranging from 15 Ne to 34 Ne, all short-lived. The longest-lived is 24 Ne with a half-life of 3.38(2) min. All others are under a minute, most under a second.

  6. Chemical element - Wikipedia

    en.wikipedia.org/wiki/Chemical_element

    Neon 10 Ne 20.180: 3: So­dium 11 ... The nature of dark matter is unknown, but it is not composed of atoms of elements because it contains no protons, neutrons, or ...

  7. Atomic number - Wikipedia

    en.wikipedia.org/wiki/Atomic_number

    The quest for new elements is usually described using atomic numbers. As of 2025, all elements with atomic numbers 1 to 118 have been observed. Synthesis of new elements is accomplished by bombarding target atoms of heavy elements with ions, such that the sum of the atomic numbers of the target and ion elements equals the atomic number of the ...

  8. List of elements by stability of isotopes - Wikipedia

    en.wikipedia.org/wiki/List_of_elements_by...

    The darker more stable isotope region departs from the line of protons (Z) = neutrons (N), as the element number Z becomes larger. This is a list of chemical elements by the stability of their isotopes. Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. [1] Overall, there are 251 known stable isotopes in ...

  9. Mass number - Wikipedia

    en.wikipedia.org/wiki/Mass_number

    Since protons and neutrons are both baryons, the mass number A is identical with the baryon number B of the nucleus (and also of the whole atom or ion). The mass number is different for each isotope of a given chemical element, and the difference between the mass number and the atomic number Z gives the number of neutrons (N) in the nucleus: N ...