Tubing through flooring

[Samjohn]

Hello.
Question- can copper tubing go through flooring in a residential setting? Or do i need to drop down with blk pipe and make connection with copper tubing below floor within flooring joists?
I can't seen to find code rule for this 
Any direction for my question is greatly appreciated!

(feeding a branch line to main floor kitchen gas range, 20'run)

[Attavior]

Yes, no issues.   Just make sure it then supported at the appliance so that it's unmovable when attaching with the appliance flex connection

[Samjohn]

Thanks for replying!
Is there a code for any piping/tubing going through floor?

[Attavior]

Only one I can think of is to have 2" of bare pipe after the threads thru the finished floor.

...... And gas connectors can not pass thru a wall or floor.   

Sorry, not at my code book.   Don't have the code references. 

[Samjohn]

Found the code you mentioned for 2" of unthreaded pipe through floor 6.12.2

Thanks for your help