The voltage source for a series circuit is a 9 V battery. Does each component of the circuit have a higher or a lower voltage than the battery? Explain your answer.

the mass of the cathode increases because ions from the solution get reduced to atoms and become part of the cathode.

explanation:

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.