melting point because the melting point is the heat required to make an object melt anything less than this poitn will not make the substence melt.
2H(+) + SO4(2-) + Ca(2+) + 2I(-) -> CaSO4(s) + 2H(+) + 2I(-)
The signs in brackets are the subscripts for the charge of the ion. This is the complete ionic equation. The net ionic equation is:
Ca(2+) + SO4(2-) -> CaSO4
There are 4 lone pairs of electrons present in the carbon dioxide molecule