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.

The modern periodic table, arranged in rows and columns, was first introduced by Dmitri Mendeleev in 1869. At the time, it included the known elements and their properties, but Mendeleev predicted ...

Apparently he was told of the need for a new refrigerant over the telephone, and with the aid of two colleagues, the use of a chemical library and some deductions from the periodic table ...

An international research collaboration has overturned the long-standing belief that the atomic nucleus of lead-208 is perfectly spherical. The discovery challenges fundamental assumptions about ...

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FILE – In this photo reviewed by U.S. military officials, the Office of Military Commissions building used for Periodic Review Board hearings stands, on April 18, 2019, in Guantanamo Bay Naval ...

Hacktivists of the Ukrainian Cyber Resistance group handed over to InformNapalm volunteer intelligence community a dump of ...

The date sheet has been made available in PDF format so students will be able to easily share and print them. Students can save and view it on phones, tablets, computers and laptops. Students can ...

Department of State designated eight international cartels as Foreign Terrorist Organizations (FTOs) and Specially Designated ...