Water is H2O, whereas Hydrogen Peroxide is H2O2 -> the extra oxygen atom changes the substance entirely.
Um for this question it is all about your beliefes and how you view them.
Carbon 12<span> has exactly 6 protons and 6 neutrons ( hence the </span>12<span> ).</span>Carbon 13<span> has 6 protons and 7 neutrons.</span>
