What happens when an electron in a hydrogen atom moves from the excited state to the ground state?
a
Continuous amounts of energy are released.
b A photon is emitted.
C A quantum of energy is absorbed.
d
A different electron moves from the ground state to
the excited state at the same time.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

you need to stop taking that class