You hold in your hand a block of material with 3x10^27 protons , 3x10^37 neutrons , and 3.1x10^27 electrons. what is the mass of the block , and what is its charge

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell