The hydrogen atom has the electronic formula of the outer (and only) electronic level 1s 1. On the one hand, in terms of the presence of one electron on the outer electronic level, the hydrogen atom is similar to alkali metal atoms. However, it, like halogens, Read more "

Ozone is a chemical gas that is a strong oxidizing agent. What properties does the gas have, and for what purposes is it produced? General information Ozone was first discovered in 1785 by the Dutch physicist M. van Marum. He noticed that when Read more "

Hydrochloric acid is a clear, colorless or yellowish liquid without suspended or emulsified particles. Hydrochloric acid is a solution of hydrogen chloride gas HCl in water. The latter is a hygroscopic, colorless Read more "

In mathematics, a fraction is a number consisting of one or more parts (fractions) of a unit. According to the form of recording, fractions are divided into ordinary (example \frac(5)(8)) and decimal (for example 123.45). Definition. Common fraction (or simple fraction) Read more "

Archimedes is an outstanding ancient Greek mathematician, inventor and engineer who lived in the 3rd century BC. e. This man was born in 287 BC. e. in the city of Syracuse in Sicily. At that time it was a colony of Ancient Greece and was called Magna Graecia. She included Read more "

The properties of amino acids can be divided into two groups: chemical and physical. Chemical properties of amino acids Depending on the compounds, amino acids can exhibit different properties. Interaction of amino acids: Amino acids as amphoteric compounds form Read more "

Broadcast From the beginning From the end Do not update Update On this minor but reasonable note, Gazeta.Ru says goodbye to lovers of everything extraterrestrial and unknown. Colorful alien dreams! —What are the orbital periods of these planets? — From 1.5 to 12 days. E Read more "

Vladimir Vladimirovich Mayakovsky was born on July 7 (19), 1893 in the village. Baghdadi (now the village of Mayakovski) near Kutaisi, Georgia. Father - forester, Vladimir Konstantinovich Mayakovsky (1857-1906), mother - Alexandra Alekseevna, nee Pavlenko (1867-1954). At 19 Read more "

An outstanding linguist, the first researcher of Russian orthoepy - the science of pronunciation, editor and compiler of the famous four-volume Explanatory Dictionary of the Russian Language, Dmitry Nikolaevich Ushakov was born on January 24 (January 12, old style) 1873 in Mo Read more "

John B. Calhoun - American ethologist and researcher of psychology in connection with the problems of population density and its influence on behavior gained fame through his experiments with communities of rodents - mice and rats. He believed that there is no logical Read more "