The periodic table shows all the atoms that everything in the known universe is made from. It’s kind of like the alphabet in which only 26 letters, in different combinations, make up many thousands of ...

Take the numbers in order from the code sheet and match them to the atomic symbols (one- or two-letter abbreviations) on the filled-in periodic table. Do that, and you’ll get a sentence (after ...

The periodic table of elements, or Mendeleev’s table, was created in 1869 by Russian chemist Dmitri Mendeleev. ... It’s likely that he read these letters during breakfast, ...

Elements in the periodic table are arranged in order of increasing atomic number. The atomic number represents the number of protons in an atom's nucleus, uniquely identifying each element.