If an atom loses a proton, what happens?

1. its mass is lowered, and it becomes a different element.

2. its mass stays the same, and it is still the same element.

3. its mass is lowered, but it is still the same element.

4. its mass stays the same, and it becomes a different element.

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.