The periodic table, also known as the periodic table of the (chemical) elements, is a rows and columns arrangement of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. It is a graphic formulation of the periodic law, which states that the properties of the chemical elements exhibit an approximate periodic dependence on their atomic numbers. The table is divided into four roughly rectangular areas called blocks. The rows of the table are called periods, and the columns are called groups. Elements from the same group of the periodic table show similar chemical characteristics. Trends run through the periodic table, with nonmetallic character increasing from left to right across a period, and from down to up across a group, and metallic character increasing in the opposite direction. The underlying reason for these trends is electron configurations of atoms. The periodic table exclusively lists electrically neutral atoms that have an equal number of positively charged protons and negatively charged electrons and puts isotopes at the same place. Other atoms, like nuclides and isotopes, are graphically collected in other tables like the tables of nuclides.
Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He is best known for formulating the Periodic Law and creating a version of the periodic table of elements. He used the Periodic Law not only to correct the then-accepted properties of some known elements, such as the valence and atomic weight of uranium, but also to predict the properties of three elements that were yet to be discovered.
Dmitri Mendeleev published a periodic table of the chemical elements in 1869 based on properties that appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium, eka-silicon, and eka-manganese, with respective atomic masses of 44, 68, 72, and 100.
The periodic table is an arrangement of the chemical elements, structured by their atomic number, electron configuration and recurring chemical properties. In the basic form, elements are presented in order of increasing atomic number, in the reading sequence. Then, rows and columns are created by starting new rows and inserting blank cells, so that rows (periods) and columns (groups) show elements with recurring properties. For example, all elements in group (column) 18 are noble gases that are largely—though not completely—unreactive.
Southwest Minnesota State University (SMSU) is a public university in Marshall, Minnesota. It is part of the Minnesota State Colleges and Universities System. The university has an enrollment of approximately 8,700 students and employs 148 faculty members. It is divided into two major colleges, the College of Arts, Letters, and Sciences and the College of Business, Education, and Professional Studies.
Julius Lothar Meyer was a German chemist. He was one of the pioneers in developing the earliest versions of the periodic table of the chemical elements. Russian chemist Dmitri Mendeleev and he had both worked with Robert Bunsen. Meyer never used his first given name, and was known throughout his life simply as Lothar Meyer.
Otto von Böhtlingk was a Russian-German Indologist and Sanskrit scholar. His magnum opus was a Sanskrit-German dictionary.
Nikolay Dmitriyevich Zelinsky was a Russian and Soviet chemist. Academician of the Academy of Sciences of the Soviet Union (1929).
The Capitoline Museums are a group of art and archaeological museums in Piazza del Campidoglio, on top of the Capitoline Hill in Rome, Italy. The historic seats of the museums are Palazzo dei Conservatori and Palazzo Nuovo, facing on the central trapezoidal piazza in a plan conceived by Michelangelo in 1536 and executed over a period of more than 400 years.
Alternative periodic tables are tabulations of chemical elements differing in their organization from the traditional depiction of the periodic system.
The Rumyantsev Museum evolved from the personal library and historical collection of Count Nikolay Rumyantsev (1754–1826). Its origin was in St. Petersburg in the Rumyantsev house or mansion, building number 44 on the English Embankment overlooking river Neva. After Nikolay died in 1826, his brother Sergei converted the house into a museum. It was opened to the general public in 1831, initially for one day a week, and the remaining days were for study.
D. Mendeleev University of Chemical Technology of Russia (MUCTR) — is a federal state budgetary higher educational institution in Moscow, and is the largest Russian center for education and research in the field of chemical technology. The history of MUCTR can be traced back to the Moscow Industrial School initially founded in 1898. The university acquired its current name and status in 1992 with its Moscow campus mainly located on Miusskaya Square and in Tushino. The university's other two branches are situated in Novomoskovsk and Tashkent (Uzbekistan).
The Faculty of Chemistry at Saint Petersburg State University is one of the leading chemistry faculties in Russia.
Lines of Vasilyevsky Island is a group of streets in a part of downtown Saint Petersburg, Russia, and their mostly numeric names atypical for the rest of the modern Saint Petersburg.
The Museum of Arts of Uzbekistan is the largest state art museum in Uzbekistan. Its permanent collection contains more than several thousands works, divided among four curatorial departments. The museum was established in 1918 as a Museum of People University and renamed as a Central Arts Museum later. It was named as Tashkent Art Museum in 1924 and finally Museum of Arts of Uzbekistan in 1935.
D. I. Mendeleev Institute for Metrology, previously known as the Main Chamber of Weights and Measures of the Russian Empire, or the Depot of Exemplary Measures and Weights, is one of the leading national metrology institutes of Russia now.
Washington, D.C., the capital of the United States, has a unique and diverse architectural history. Encompassing government, monumental, commercial, and residential buildings, D.C. is home to some of the country's most famous and popular structures designed by some of the leading architects of their time. The popularity of Washington's buildings is evident by the fact that a 2007 poll of Americans by the American Institute of Architects found that six of the top 10 most popular U.S. structures were located in Washington, D.C. Overall, 17 of the top 150 most popular structures were located in the capital.
