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Se - Selenium

Seleinium has been widely researched as a critical element for warding off cancer. Taking 200-400mcg per day is said to decrease cancer risk by up to 70%. Selenium was discovered by J. J. Berzelius in 1817 in Sweden.

Atomic number - 34 Density g/mL 4 .8
Atomic weight u 78 .96 Melting point K 494
Bonding radius A 1 .16 Boiling point K 958
Atomic radius A 1 .22 Heat of vaporization kJ/mol 37 .7
Ionization Potential V 9 .752 Heat of fusion kJ/mol 6 .694
Electronegativity - 2 .55 Specific heat J/gK 0 .32
The oxide is a strong acid.
Crystal are hexagonal.

Electron config. : [Ar] 3d10 4s2 4p4

 

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

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 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

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