Che model of the atom has changed as scientists have gathered new evidence. Four models of the atom are -hown below, but one important model is missing.
Which atomic model is missing from this set?

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