Currently, the seventh period of the periodic table has been completed, with the recent addition of four elements in December 2015. University of St Andrews Early periodic table chart from around ...

Scientists have found that our bodies need 28 different elements to function properly. These are almost one-quarter of the periodic table and are mainly found in the first four periods.

The 12 Zodiac signs are split into four element groups: fire, water, earth and air. These provide further context and nuances to who you are.