Isotopes are the atoms of same element having different number of neutrons. The number of protons is same in all the isotopes which means that all the atoms have same atomic number. Having different number of neutrons, these atoms have different mass number but same atomic number.
Carbon-12, Carbon-13, and Carbon-14 have same atomic number - 6 but different mass number i.e have different number of neutrons.
Carbon-12 has 6 neutrons, carbon-13 has 7 neutrons and carbon 14 has 8 neutrons. These are different isotopes of the same element.
Answer:In the case of burning wood, stored potential energy (in the form of chemical energy) in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the potential chemical energy into kinetic energy in the form of heat.
