In a molecule of calcium sulfide, calcium has two valence electron bonds, and a sulfur atom has six valence electrons. how many lone pairs of electrons are present in the lewis structure of calcium sulfide?

 Calcium Sulfide is an ionic compound made up of Ca²⁺ and S²⁻.Ca²⁺ is formed as,
                                   Ca    →    Ca²⁺  +  2 e⁻
These two electrons are accepte by Sulfur as,
                                     S  +  2 e⁻    →    S²⁻
So, before accepting 2 electrons S was having six valence electrons, after accepting two electrons from Ca it has 8 electrons which are present in four pairs.

This would be canberra.

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)