2 Na + 2 H2O → 2 NaOH + H2 (balanced equation)
The answer would be 2, since 2 in the coefficient of both Na and NaOH
AgNO3+NaCl yields AgCl+NaNo3 (reduction)
...that's the only one I know
2H2O➡2H2+O2 is the correct balanced equation of decomposition
Because decomposition means a molecule breaking down in to segments
The atomic number tells the number of protons.
The answer to this is a solution