Name the three general categories into which the elements are divided.

The 3 categories are Metals, Nonmetals, and Metalloids. 

Metals: "Good conductors of heat, malleable, ductile, shiny, few electrons in outer energy level Good conductors of heat, malleable, ductile, shiny, few electrons in outer energy level."

Nonmetals:"Poor conductors of heat, not malleable or ductile, not shiny, almost complete set of electrons in outer energy level."

Metalloids: "Also called semiconductors have properties of both."

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What was the length to begin with?