
bohr model of helium
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Seed590003440
Enhanced Promptatomic number 2, electron configuration 1s^2 2s^2, two protons, two neutrons, two electrons, one electron shell, spherical atom model, atomic radius approximately 31 picometers, atomic mass 4.0026 u, first ionization energy 2379 kJ/mol, second ionization energy not applicable, noble gas core, stable isotope He-4, most common isotope, covalent radius 28 pm, van der Waals radius 21 pm, electronegativity 4.0 on the Pauling scale, atomic mass unit 4.002602 u, isotopes He-3, He-6, He-7, and He-8, electron affinity negligible, electron configuration notation [He], atomic weight average 4.002603 u, spin quantum number 0, magnetic moment 0, nuclear quadrupole moment 2.4 barn b, nuclear magnetic resonance frequency 50 MHz/T, nuclear spin 0, stable under standard conditions, monoatomic gas, monatomic element, unreactive, nonmetal, noble gas group 18, period 1, block s-block, group number 18, series alkali metals, series noble gases, discovery 1868, discoverer J.J. Thomson, named after Johan Jakob Helium, symbol He, IUPAC symbol He, atomic number 2, molar volume 22.4 L/mol, density 0.178 g/L, boiling point 4.23 K, melting point 3.19 K, critical temperature 5.19 K, critical pressure 2.27 MPa, sublimation enthalpy 0.012 kJ/g, specific heat capacity 5.193 J/(mol*K), thermal conductivity 0.151 W/mK, electrical conductivity 0.000016 S/m, viscosity 10.2 μPa*s, surface tension 0.017 N/m, refractive index 1.000036, optical dispersion 0.000001, photoelectric effect work function 24 eV, ionization potential 24.587 eV, excitation energy 20.596 eV, ground state energy level -78.97 eV, excited state energy levels -67.76 eV, -65.94 eV, -63.73 eV, -61.69 eV, -59.79 eV, -57.95 eV, -56.25 eV, -54.71 eV, -53.33 eV, -51.99 eV, -50.81 eV, -49.87 eV, -48.98 eV, -47.16 eV, -45.41 eV, -43.72 eV, -42.09 eV, -40.52 eV, -38.99 eV, -37.51 eV, -36.07 eV, -34.68 eV, -33.32 eV, -31.99 eV, -30.69 eV, -29.43 eV, -28.21 eV, -27.02 eV, -25.88 eV, -24.77 eV, -23.70 eV, -22.66 eV, -21.65 eV, -20.67 eV, -19.72 eV, -18.80 eV, -17.90 eV, -17.03 eV, -16.18 eV, -15.35 eV, -14.55 eV, -13.77 eV, -13.01 eV, -12.27 eV, -11.55 eV, -10.85 eV, -10.17 eV, -9.51 eV, -8.86 eV, -8.23 eV, -7.62 eV, -7.03 eV, -6.46 eV, -5.91 eV, -5.38 eV, -4.87 eV, -4.38 eV, -3.91 eV, -3.46 eV, -3.03 eV, -2.62 eV, -2.23 eV, -1.86 eV, -1.51 eV, -1.18 eV, -0.87 eV, -0.58 eV, -0.31 eV, 0.00 eV