Conductors, other than flexible cords, flexible cables, and fixture wires, are required without exception or other permission to be protected against overcurrent in accordance with their ampacity specified in 310.15 at the source connection point of the conductor.

2. they have negligible mass.

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.

It's have to be 12 or idk

The sample with the lowest specific heat capacity will have the greatest temperature increase. in this case, it would be platinum.