(TXT) 19 K Potassium (plaintext)
       
        H                                                  He
        Li Be                               B  C  N  O  F  Ne
        Na Mg                               Al Si P  S  Cl Ar
       [K ]Ca Sc Ti V  Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
        Rb Sr Y  Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I  Xe
        Cs Ba La Hf Ta W  Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
        Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
                                                             
              Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu      
              Th Pa U  Np Pu Am Cm Bk Cf Es Fm Md No Lr      
       
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       | 19     _  __       |
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       |                    |
       |      Potassium     |
       |      39.0983 u     |
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 (TXT) Wiki Article:           Potassium
       Electron Configuration: [Ar]4s1
       Electronegativity:      0.82
       Atomic Radius:          275 pm
       Ionization Energy:      4.341 eV
       Electron Affinity:      0.501 eV
       Oxidation States:       1
       Standard State:         Solid
       Melting Point:          336.53 K
       Boiling Point:          1032 K
       Density:                0.89 g/cm3
 (DIR) Family:                 Alkali metal
       Year Discovered:        1807
       Number of Neutrons:     20
       Number of Protons:      19
       Number of Electrons:    19
       Number of Valence:      1
       Valency:                1
       Group:                  1
       Period:                 4
 (DIR) Shell:                  s-shell
       Specific Heat:          0.757 J/g K
       Radioactive:            0
       Occurrence:             Natural
 (DIR) Source:                 Dying high-mass stars