A sexy transistor are two type. NPN and PNP..... c means common b means base .
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result of output characteristics of npn transister in CB mode
Common emitter is the preferred circuit because the collector voltage drops to a well defined low value when the transistor is 'on', therefore it absorbs only a small amount of power.
Without knowing things about the circuit that you don't give, this question can't be answered. The 2N2222, as any other bipolar transistor, can give large amounts of voltage gain in both CE & CB configuration, but less than one voltage gain in CC configuration. Nothing is unique about the 2N2222.
Slightly less than cc configuration but greater than cb
The base is excited by a very low current. That turns the transistor on so that a higher amount of current flow comes out.