There are currently 118 known elements on the periodic table, and we've put 20 of them below to create a brain game that ...

Electronegativity, an essential characteristic of all elements in the periodic table, measures an atom's ability to attract ... with a large difference indicating a polar covalent bond (e.g., H-F bond ...

The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, ...

This year we celebrate the 150 th anniversary of Mendeleev’s achievement in formulating the structure of the periodic table that we use today. He announced his structure in 1869, but the challenge of ...

The transition elements are placed between groups 2 and 3 in the periodic table ...

Want to learn more about this centerpiece of chemistry? Take your pick from this collection of links about elements and the periodic table! Build an element ball, solve periodic puzzles, and check out ...

You may use table navigation commands for the screen reader of your choice. The Periodic Table of Elements. Each entry contains the atomic number, chemical symbol, and atomic mass to two decimal ...

The periodic table of elements (often known simply as the periodic table) has been helping scientists with their work for a little over 150 years. The handy visual reference guide organizes known ...

The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.