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The periodic table organizes the 118 currently recognized chemical elements, but water and sodium chloride are not elements.Rather, both are substances that are made up of a combination of elements in a fixed ratio.In living organisms, which are always taking in carbon, the levels of carbon 14 likewise stay constant.

In fact, evidence suggests that life on Earth began in the water, more specifically in the ocean, which has a combination of water and salts, most prominently common table salt – sodium chloride.Carbon 14 is continually being created in the Earth's atmosphere by the interaction of nitrogen and gamma rays from outer space.Since atmospheric carbon 14 arises at about the same rate that the atom decays, the Earth's levels of carbon 14 have remained constant.But where do water and these common salts appear on the great organizer of the elements, the periodic table? Figure 1: Life on Earth depends on water, not only for key biological functions but also for pleasure.Well they, and millions of other substances, are not found on the most famous of all chemistry references: the periodic table. For example, this relaxing oasis on the Mediterranean Sea, Cala Tío Ximo beach in Benidorm, Spain.