National Periodic Table Day, observed annually on February 7, honors one of the most significant achievements in scientific history—the periodic table.

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

They are seeking good fortune in their hunt for an elusive entity: element 119. The periodic table looks complete, but it isn’t. The race is on to discover the table’s next row of elements ...

The periodic table, as we know it today, has a beautiful history and it is a testimony to the ability of scientists to accommodate new discoveries of elements into their thinking and seek out patterns ...

The periodic table organizes chemical elements based on atomic weight, electron configurations, and chemical properties, reflecting the evolving nature of chemistry with updates like new elements and ...

1. Periodic Table as Arranged by Mendelejeff attention to the fact that “the eighth element, starting from a given one, is a kind of repetition of the first, like the eighth note of an octave in ...

An international team of scientists has unveiled new insights into the dissociation dynamics of sulfur hexafluoride (SF6) ...

At first a crusader for workplace safety, the trained physician railed against the use of the toxic and ubiquitous material ...

Watch the exclusive premiere of their new music video for “Blink Twice.” ...

An international team of scientists has unveiled new insights into the dissociation dynamics of sulfur hexafluoride (SF6) ...

Loss, love and a sense of belonging — survivors, evacuees, heroes and allies weigh in on what the fires revealed ...