Which atom in the table is an isotope of the atom which has the composition 11p, 11e and 14n? Give a reason for your choice. And can someone please just explain what is wants from me thank you.

Pls i really am in a hurry

When hydrogen peroxide (h2o2) is added to potassium iodide (ki) solution, the hydrogen peroxide decomposes into water (h2o) and oxygen (o2). the chemical equation for the decomposition reaction is: 2h2o2—> 2h2o + o2. what is the role of the potassium iodide in this reaction? a. reactant. b. product. c. precipitate. d. catalyst.