Which of the following is true about metallic bonding? A. They dissolve in water

B. Found in metals; holds metal atoms together very strongly

C. Formed between nonmetallic elements

I think the answer is option B

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.