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Lanthanides and actinides: position in the periodic system
Lanthanides and actinides: position in the periodic system

Lanthanides and actinides are two families that contain 14 chemical elements each, as well as the metals themselves - lanthanum and actinium. Their properties - both physical and chemical - will be considered by us in this paper

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What is rhetoric and its basics
What is rhetoric and its basics

The science of eloquence appeared in ancient times. Consider the different meanings of the word. What is the essence of rhetoric?

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  • Faculties and speci alties: Agrarian University, Krasnoyarsk
    Faculties and speci alties: Agrarian University, Krasnoyarsk

    In Russia, agrarian educational institutions are engaged in the training of specialists for agriculture, one of which is the Krasnoyarsk Agrarian University. Abbreviated designation - KrasGAU. What faculties are there? What speci alties does the Agricultural University (Krasnoyarsk) offer?

  • Duke of Alba: biography
    Duke of Alba: biography

    The Duke of Alba is a statesman and Spanish general. He also became known for his brutal rule in the Netherlands, where he earned the nickname "Iron Duke"

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"During" or "during"? Derivative preposition or noun?
"During" or "during"? Derivative preposition or noun?

This article tells you how to make the right choice and how to write correctly: "during" or "during". Various contexts and situations are considered. Usage examples are given for both cases

  • Structure of a vertebra. Features of the structure of the vertebrae of the cervical, thoracic and lumbar spine

    It is known that the human spine consists of thirty-four vertebrae, five of which belong to the lumbar region, seven to the cervical, twelve to the thoracic, five each to the sacral and coccygeal regions. Changes taking place with the earth's climate (in particular, its warming in the future) can contribute to the fact that the body and head of a person will be more elongated, the spine will be thicker with the sacrum fused with the lumbar region. But these are hypothetical realities of future millennia

  • Aircraft. Invention history

    People have always dreamed of flying. They observed birds and invented various wing designs for flight. But the first aircraft that lifted a man into the air was devoid of wings

  • Participants of the Third Crusade, goal, results

    The Crusades arose during the reign of Pope Gregory the Seventh and were aimed at liberating Palestine and Jerusalem, where the Holy Sepulcher was located, from the "infidels", as well as spreading Christianity by military means among pagans, Muslims, residents of Orthodox states and heretical movements

  • Ancient Palestine: history, culture and traditions. Ancient Phenicia and Palestine

    The history of Ancient Palestine before the emergence of writing is usually divided into three stages. The first, which lasted until the 10th millennium BC, shows that people in this region were mainly engaged in gathering and hunting. In the period 10,000-5,300 BC, the inhabitants of most of the Palestinian lands mastered agriculture, later they moved into the era of cities, which was characterized by the emergence of trade, permanent settlements that protected the nascent armies