Find the unit normal vector at the given point. 
Definitions:
Atom
The smallest unit of a chemical element, consisting of a nucleus and electrons, forming the basis of all chemical substances.
Knock
A term often used in automotive to describe the premature combustion of fuel in the cylinder of an engine, leading to inefficient performance.
Compound
A substance formed when two or more chemical elements are chemically bonded together.
Properties
Characteristics or attributes that define the behavior, state, or qualities of a system, substance, or object, in various contexts.
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