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2 He Helium (plaintext) |
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H [He] |
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Li Be B C N O F Ne |
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Na Mg Al Si P S Cl Ar |
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K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr |
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Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe |
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Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn |
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Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og |
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Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu |
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Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr |
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| 2 _ _ | |
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| | | | | ___ | |
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| | |_| |/ _ \ | |
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| | _ | __/ | |
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| |_| |_|\___| | |
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| Helium | |
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| 4.00260 u | |
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Wiki Article: Helium |
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Electron Configuration: 1s2 |
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Electronegativity: |
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Atomic Radius: 140 pm |
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Ionization Energy: 24.587 eV |
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Electron Affinity: |
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Oxidation States: 0 |
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Standard State: Gas |
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Melting Point: 0.95 K |
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Boiling Point: 4.22 K |
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Density: 0.0001785 g/cm3 |
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Family: Noble gas |
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Year Discovered: 1868 |
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Number of Neutrons: 2 |
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Number of Protons: 2 |
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Number of Electrons: 2 |
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Number of Valence: 2 |
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Valency: 0 |
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Group: 18 |
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Period: 1 |
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Shell: s-shell |
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Specific Heat: 5.193 J/g K |
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Radioactive: 0 |
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Occurrence: Natural |
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Source: The big bang |
