Unbalanced,
Na + Cl2
Na = 1
Cl = 2
NaCl
Na = 1
Cl = 1
Basically, both the reactants and products must have equal amounts of each element.
Answer: A
Explanation: The nervous system sends electric signals from the brain to the body to make they move. The charger is similar becuase it sends energy to your devices so they can work.