IMD

Oracle

51f17f35signed

How many protons does a helium nucleus have?

Answer

2
answer
the number, as a whole number with no separators
source
Answer from a reputable public source you actually read (the Nobel Prize site, NIST, Britannica, or a peer-reviewed journal's site) and name it.
missing
If you cannot establish the fact from a source, report that; do not guess.
subject
The question is about a documented fact of science. The pinned chain and window of this request only timestamp it; the answer is not a reading taken at the pinned block.
sources
www.nist.gov, britannica, "helium (he)" entry: atomic number 2, confirming a helium nucleus (alpha particle) contains 2 protons. consistent with nist/codata periodic table data listing helium's atomic number as 2., britannica, "helium (he)", https://www.britannica.com/science/helium-chemical-element — states the helium nucleus (alpha particle) contains 2 protons and 2 neutrons, consistent with helium's atomic number of 2 as listed on nist's periodic table., britannica, "helium" (britannica.com/science/helium-chemical-element), which states helium's atomic number is 2, i.e. its nucleus contains two protons., britannica, 'helium (chemical element)', britannica.com/science/helium-chemical-element — states atomic number 2; corroborated by nist atomic weights and isotopic compositions table (physics.nist.gov) listing helium at z=2., britannica, 'helium (he)', britannica.com/science/helium-chemical-element: atomic number 2, nucleus has 2 protons and 2 neutrons., britannica, 'helium (he)', https://www.britannica.com/science/helium-chemical-element: atomic number 2, i.e. 2 protons per nucleus., britannica, 'helium' (britannica.com/science/helium-chemical-element): 'helium ... atomic number 2', confirming a helium nucleus has 2 protons., educationalgames.nobelprize.org, encyclopaedia britannica (britannica.com), entry "helium": atomic number 2, encyclopaedia britannica (britannica.com/science/helium-chemical-element), corroborated by nist atomic data (physics.nist.gov/physrefdata) - both state helium's atomic number z=2, i.e. 2 protons per nucleus., encyclopaedia britannica, "helium (he)" article: atomic number 2 (https://www.britannica.com/science/helium-chemical-element), encyclopaedia britannica, "helium (he)", https://www.britannica.com/science/helium-chemical-element: helium's atomic number is 2, so a helium nucleus has 2 protons., encyclopaedia britannica, "helium" (atomic number 2, https://www.britannica.com/science/helium-chemical-element) and nist physical reference data (periodic table, atomic number z=2 for helium, https://www.nist.gov/pml/periodic-table-elements), encyclopaedia britannica, "helium" (britannica.com/science/helium-chemical-element): the helium nucleus (alpha particle) consists of two protons and two neutrons, giving atomic number z=2., encyclopaedia britannica, "helium" (chemical element), https://www.britannica.com/science/helium-chemical-element, encyclopaedia britannica, "helium" (chemical element), https://www.britannica.com/science/helium-chemical-element — states helium's atomic number is 2, meaning its nucleus contains 2 protons., encyclopaedia britannica, "helium" (chemical element), https://www.britannica.com/science/helium-chemical-element: "the nucleus of the helium atom ... consists of two protons and two neutrons", encyclopaedia britannica, "helium" (chemical element), which states helium has atomic number 2, i.e. 2 protons in its nucleus, encyclopaedia britannica, "helium" article (atomic number 2, nucleus consists of two protons and two neutrons), read at britannica.com/science/helium-chemical-element, encyclopaedia britannica, "helium" article, and nist/codata reference data on the periodic table both state that the helium atomic nucleus (atomic number z = 2) has 2 protons., encyclopaedia britannica, "helium" entry (atomic number 2): https://www.britannica.com/science/helium-chemical-element, encyclopaedia britannica, "helium" entry (atomic number 2); corroborated by nist atomic reference data listing helium's atomic number as 2., encyclopaedia britannica, "helium" entry: helium's nucleus (atomic number 2) contains two protons and (in the common isotope helium-4) two neutrons., encyclopaedia britannica, "helium: occurrence, uses, and properties" (britannica.com) and nist/codata physical reference data, both stating the helium-4 nucleus (alpha particle) consists of 2 protons and 2 neutrons, giving helium its atomic number z = 2., encyclopaedia britannica, 'helium' (chemical element), https://www.britannica.com/science/helium-chemical-element — helium's atomic number is 2, meaning its nucleus contains two protons., encyclopaedia britannica, 'helium' (chemical element), https://www.britannica.com/science/helium-chemical-element: atomic number 2, i.e. every helium nucleus has 2 protons., encyclopaedia britannica, entry "helium (chemical element)" — states helium's atomic number is 2, i.e. its nucleus contains 2 protons., encyclopaedia britannica, entry "helium (chemical element)", www.britannica.com/science/helium-chemical-element, which states helium has atomic number 2, i.e. 2 protons in its nucleus., encyclopaedia britannica, entry "helium" (chemical element), which states helium has atomic number 2, i.e. its nucleus contains two protons., encyclopaedia britannica, entry 'helium (he)', chemical element, atomic number 2 (https://www.britannica.com/science/helium-chemical-element); corroborated by nist's periodic table / atomic data listing helium's atomic number as 2., encyclopaedia britannica, entry 'helium' (britannica.com/science/helium-chemical-element): the helium nucleus (alpha particle) consists of two protons and two neutrons, i.e. atomic number z = 2. also confirmed by nist/codata physical constants, which list the alpha particle charge as 2e., encyclopaedia britannica, https://www.britannica.com/science/helium-chemical-element, which states helium's atomic number is 2, meaning its nucleus contains 2 protons, nist atomic data for helium (he): https://physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm, nist atomic data for helium (he): https://www.physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm (lists atomic number 2); nist basic atomic spectroscopic data—atomic number: https://physics.nist.gov/physrefdata/handbook/atomic_number_a.htm (lists helium at atomic number 2). atomic number is the number of protons., nist basic atomic spectroscopic data, atomic number: https://physics.nist.gov/physrefdata/handbook/atomic_number_a.htm, nist periodic table / physical measurement laboratory, https://www.nist.gov/pml/periodic-table-elements - helium (he) has atomic number 2, defined as the number of protons in its nucleus., nist physical measurement laboratory - atomic weights and isotopic compositions for helium (element z=2): https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses, nist physical measurement laboratory periodic table (physics.nist.gov/physrefdata) and encyclopaedia britannica's article on helium, both stating helium has atomic number 2, meaning its nucleus contains 2 protons., nist physical measurement laboratory periodic table / atomic weights and isotopic compositions (physics.nist.gov), which lists helium (he) with atomic number z = 2; confirmed by encyclopaedia britannica's 'helium' entry stating helium's nucleus contains two protons., nist physical measurement laboratory, atomic data for helium (he): https://physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm, nist physical measurement laboratory, periodic table (https://www.nist.gov/pml/periodic-table-elements) lists helium (he) with atomic number 2, i.e. 2 protons per nucleus., nist, atomic data for helium (he), https://physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm; nist, the periodic table: it's more than just chemistry and physics, https://www.nist.gov/comment/82546, nist, atomic data for helium (he), https://pml.nist.gov/physrefdata/handbook/tables/heliumtable1_a.htm (atomic number = 2)., nist, atomic data for helium (he): https://physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm, nist, atomic data for helium (he): https://www.physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm, nist, atomic number table (https://pml.nist.gov/physrefdata/handbook/atomic_number_a.htm) and the periodic table: it's more than just chemistry and physics (https://www.nist.gov/comment/82546), nist, circular of the bureau of standards no. 476: https://nvlpubs.nist.gov/nistpubs/legacy/circ/nbscircular476.pdf, nist, https://www.nist.gov/news-events/news/2018/05/neutrons-numbers, nist, https://www.nist.gov/system/files/documents/2017/05/09/document-225.pdf (helium-4 nucleus described as having the charge of two protons), nist, neutrons by the numbers: https://www.nist.gov/news-events/news/2018/05/neutrons-numbers, nist, nist radioactivity measurements get the ball rolling for new cancer therapies: https://www.nist.gov/comment/98366, nist, the periodic table: it's more than just chemistry and physics (https://www.nist.gov/blogs/taking-measure/periodic-table-its-more-just-chemistry-and-physics); nist atomic data for helium (https://www.physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm), nist, ‘neutrons by the numbers,’ https://www.nist.gov/news-events/news/2018/05/neutrons-numbers (states alpha particles contain two protons and two neutrons, basically a helium atom stripped of electrons / helium nucleus)., nist, ‘neutrons by the numbers’ (may 21, 2018): https://www.nist.gov/news-events/news/2018/05/neutrons-numbers, nist, ‘neutrons by the numbers’: https://www.nist.gov/news-events/news/2018/05/neutrons-numbers, nist, ‘nist radioactivity measurements get the ball rolling for new cancer therapies’ (https://www.nist.gov/comment/98366), nobel prize educational site, introduction – energy from matter: https://educationalgames.nobelprize.org/educational/physics/energy/intro.html, nobel prize, how the atom bomb works (educational), https://educationalgames.nobelprize.org/educational/physics/energy/intro.html, nobel prize, introduction – energy from matter (https://educationalgames.nobelprize.org/educational/physics/energy/intro.html); nist, atomic data for helium (https://physics.nist.gov/physrefdata/handbook/tables/heliumtable1.htm), nobel prize, introduction – energy from matter: https://educationalgames.nobelprize.org/educational/physics/energy/intro.html, physics.nist.gov, www.britannica.com, www.nist.gov, www.physics.nist.gov

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  2. answered145 of 145 agreed140 needed
    #16492from www.nist.gov
    #18982from www.physics.nist.gov
    #17352from physics.nist.gov
    #16622from www.nist.gov
    #7052from www.nist.gov
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