Almost all the elements in the universe are composed of atoms siblings though are chemically equivalent but have slightly different weight. Atom is composed of equal number of electrons and protons to make it electrically neutral and stable. There are also neutrons which are electrically neutral but have weight almost equal to the proton. Protons and neutrons reside in the centre of atom and called jointly nucleus. This is due to the different numbers of neutrons in these atoms. More the neutrons more shall be the weight of the isotope. Oxygen has two prominent isotopes. The lighter one contains 8… Read More »Ice hides memories of past climate!!!!