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Periodic Table

Atomic No. Order:e

Alphabetic Order:

Selenium

Symbol:

Atomic Number:

Atomicmass:

78.96 g.mol -1

Electronegative (According to Pauling):

2.4

Density:

4.79 g.cm-3 at 20°C

Melting Point:

217 °C

Boiling Point:

688 °C

Venderwaals Radious:

0.14 nm

Ionic Radious:

0.198 nm (-2) ; 0.042 nm (+6)

Isotopes:

Electronic Shell:

[ Ar ] 3d10, 4s2, 4p4

Energy Of First Ionisation:

940,7 kJ.mol -1

No of Protons

Standard Potential:

- 0.77 V

Electorn in Full Shell

Discoverd By:

Discovered by Jons Berzelius in 1817

Electorn in Partial Shell

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