Which of these materials is an insulator?

In a cathode ray tube, why do $e-$ (electrons) move from the negative end (cathode) to the positive end (anode)?

Why are metals good conductors of $\mathrm{electric} \mathrm{current}$?

Which of the following statements about electric charge is true?

Which of the following best describes the electrical charge of a neutron?

Why are metals generally good conductors of electric current $I$?