Which location represents a period on a periodic table?   a. a vertical row   b. a horizontal row   c. a diagonal row on the periodic table   d. a row on the left and right of the table

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.

i think its 100.

hope this !