The inner asteroid belt is ____________ and ____________ compared to the outer asteroid belt, as shown in the following graph. 
Definitions:
Oxygen
A chemical element with symbol O and atomic number 8, essential for aerobic respiration in living organisms.
Lewis Structure
A diagram that represents the bonding of atoms within a molecule using dots for electrons and lines for bonds.
Acetonitrile
A colorless, volatile liquid used as a solvent in organic synthesis and in the pharmaceutical industry.
Lone Pairs
Pairs of valence electrons that are not shared with another atom and do not participate in bonding, but significantly influence the shape and properties of molecules.
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