what particles are free to drift in metals?

cations, electrons, neutrons, or protons?

and what is the SI unit of mass? is it kilogram

kg is correct for the SI unit of mass. Electrons conduct electricity; therefore, the electrons must be free to move in metals.

2 answers

Which of the following are free to drift in metals?

a. neutrons

b. electrons

c. pions

d. cations

e. protons
cations