No not if there are factory or houses that causes stuff like global warming
Oil and natural gas were formed from the remains of prehistoric plants and animals—that's why they're called fossil fuels. Hundreds of millions of years ago, prehistoric plant and animal remains settled into the seas along with sand, silt and rocks.
Isotopes
Atoms of the same element; number of protons remain the same, number of neutrons vary. Chemical properties remain the same. Atomic mass varies.
Na sodium with 11 neutrons = atomic mass of 22
With 22 neutrons the mass is 23.
Both have 11 protons in the nucleus.