Add Yahoo as a preferred source to see more of our stories on Google. The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements.

This video explains how we can use information from the periodic table to identify an element’s atomic number and mass number. The atomic number tells you how many protons are in the atom. In a ...

As the 150th anniversary of the formulation of the Periodic Table of Chemical Elements looms, a Michigan State University professor probes the table's limits in a recent Nature Physics Perspective.

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The heaviest element that humans have ever found is called oganesson. Each atom of the stuff packs a whopping 118 protons into its dense center. In contrast, hydrogen—the most abundant element in the ...

The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...