red selenium

red selenium

formula | Se_8 name | red selenium IUPAC name | octaselenocane alternate names | alpha-selenium | crystalline monoclinic selenium | cyclooctaselenium | octaselenium | octaselenocane | selenium red mass fractions | Se (selenium) 100%

Draw the Lewis structure of red selenium. Start by drawing the overall structure of the molecule: Count the total valence electrons of the selenium (n_Se, val = 6) atoms: 8 n_Se, val = 48 Calculate the number of electrons needed to completely fill the valence shells for selenium (n_Se, full = 8): 8 n_Se, full = 64 Subtracting these two numbers shows that 64 - 48 = 16 bonding electrons are needed. Each bond has two electrons, so the above diagram has all the necessary bonds. There are 8 bonds and hence 16 bonding electrons in the diagram. Lastly, fill in the remaining unbonded electrons on each atom. In total, there remain 48 - 16 = 32 electrons left to draw: Answer: | |

molar mass | 631.77 g/mol phase | solid (at STP) density | 4.39 g/cm^3

density | 4.39 g/cm^3

specific heat of formation Δ_fH° | gas | 0.3595 kJ/g | solid | 0.01061 kJ/g molar heat of formation Δ_fH° | gas | 227.1 kJ/mol | solid | 6.7 kJ/mol (at STP)

CAS number | 12597-33-0 PubChem CID number | 139346 PubChem SID number | 10506128 SMILES identifier | [Se]1[Se][Se][Se][Se][Se][Se][Se]1 InChI identifier | InChI=1S/Se8/c1-2-4-6-8-7-5-3-1