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Definition: A single bond is a chemical link between two atoms in which electrons are shared between them. Examples: There is a single bond between the oxygen and each hydrogen in a water molecule (H 2 O). Each of the covalent bonds contains two electrons-one from a hydrogen atom and one from the oxygen atom.
Total valence electrons is 8. Ca -- S (-- is single bond) this needs 6 more electrons as a single bond is only 2 electrons. So you put 3 lone pairs on each atom but this makes it so there are 14 electrons. Take 2 lone pairs off of both atoms so each Atom only has 1 Lone pair.