Are my Question's too hard to handle?
i wanted to know the Atmel AVR's compatible with the Arduino or Capable of being programmed by Arduino
Other ATmega/AVRTo use a different ATmega/AVR chip, you'll need to make changes to the Arduino core, which is in the hardware/cores/arduino sub-folder of the Arduino application directory. This shouldn't be too hard, but it will require reading the datasheet for your chip. In particular, the names of registers and register bits are likely to vary between microcontrollers.