The bonding explanation for Fe2S3 involves the electron configurations of iron (Fe) and sulfur (S). Iron, with the configuration [Ar] 3p6 4s2, requires the loss of 7 electrons to achieve a neutral state, while sulfur, with the configuration [Ne] 3s2 3p4, needs to gain 2 electrons. This electron transfer leads to the formation of ionic bonds in Fe2S3, where two iron atoms donate electrons to satisfy the electron needs of three sulfur atoms.
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transgalactic said:http://img204.imageshack.us/img204/5596/75669110kx5.th.gif
this is the solution
how they got it from this data:
Fe=[Ar]3p^6 4s^2 it needs to give 7 electrons to become neutral.
S=[Ne]3S^2 3p^4 it needs to take 2 electrons to become neutral.