What are enantiomers (optical isomers)?
Enantiomers are 2 stereoisomers which are mirror images of one other and therefore are non-superimposable.
How are covalent compounds formed?
Covalent compounds are formed when 2 electronegative atoms are forced to share one or more pairs of electrons.
What is an electron configuration of an atom?
It is an account of how many electrons there are in the atom and what orbitals they reside in (under normal conditions).