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34 Se Selenium (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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| 34 ____ | |
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| / ___| ___ | |
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| \___ \ / _ \ | |
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| ___) | __/ | |
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| |____/ \___| | |
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| | |
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| Selenium | |
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| 78.97 u | |
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Wiki Article: Selenium |
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Electron Configuration: [Ar]4s2 3d10 4p4 |
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Electronegativity: 2.55 |
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Atomic Radius: 190 pm |
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Ionization Energy: 9.752 eV |
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Electron Affinity: 2.021 eV |
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Oxidation States: +6, +4, -2 |
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Standard State: Solid |
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Melting Point: 493.65 K |
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Boiling Point: 958 K |
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Density: 4.809 g/cm3 |
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Family: Nonmetal |
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Year Discovered: 1817 |
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Number of Neutrons: 45 |
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Number of Protons: 34 |
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Number of Electrons: 34 |
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Number of Valence: 6 |
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Valency: 2 |
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Group: 16 |
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Period: 4 |
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Shell: p-shell |
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Specific Heat: 0.321 J/g K |
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Radioactive: 0 |
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Occurrence: Natural |
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Source: Dying high-mass stars |
