Can i plug 7.4(8.4)Volts in VIN of my arduino nano?

i dont know how to view datasheets etc. nor i can get a good answer to it. what Volts does arduino nano (clone) takes in VIN?

oh and an extra question, can i use 3V3 for powering NRF24L01 2.4Ghz module?

7-12V
But I would keep it below 9volt.
The 3.3volt supply is stolen from the USB chip.
I would not draw more than 30mA from that pin.
But that should be enough for the basic NRF24L01 module.
Don't forget that capacitor across VCC of the NRF.
Leo..

im talking with ai with the length, wingspan etc and electronics and it said that put a 47nf* 16V electronic condenser to decrease reseting, is it true?

No. Off by a factor 1000. Make that 47uF.
A 47nF electrolytic would be rare and tiny.
Leo..

so i need 47uf and not 47nf?

Correct. Anything between 10 and 100 uF is fine (value is not critical).
Leo..

thanks a lot mate :D