Брелок 20х30 мм. Селен. Se Keyring 20x30 mm. Articul: pt34
600,00 ₽
Брелок 20х40 мм. Селен (Se) Se keychain 20x40 mm. Articul: 34177
700,00 ₽
Trinket. Selenium. Articul: 3417120420
700,00 ₽
Игральная кость классическая 10 мм. Se Dice classic 10 mm Se Articul: dc12
500,00 ₽
Кубик из селена (Se), 99,99%, 10х10 мм. Se cube 10 mm
5 100,00 ₽
Кулон. Селен. Pendant. Selenium.
900,00 ₽
Пуговица 18 мм. Селен. Se. Chemical button 18 mm. Articul: but34
340,00 ₽
Селен (Se), 99,9%, 0,1 гр. – в ампуле. Selenium (Se), 99.9%, 0.1 gr. - in an ampoule. Articul: 3411120220
600,00 ₽
Selenium (Se), 99.99%, 3 gr. - in a glass jar. Articul: 3412110418
350,00 ₽

Atomic number     34

Atomic mass       78,96

Density, kg / м?     4790
melting temperature, ° С         217
Selenium is a brittle black non-metal shiny at the fracture. The element was discovered in 1817 by I. Berzelius (the name is given from the Greek selene - Moon). Selenium is a very rare and trace element. The history of Selene in the earth's crust is closely related to the history of sulfur. Significant amounts of selenium are obtained from copper electrolyte sludge, in which selenium is present in the form of silver selenide.
Due to its effect on DNA repair, endocrine and immune systems, and other mechanisms, including its antioxidant properties , selenium may play a role in cancer prevention.  
Selenium is somewhat similar in nature to arsenic; possesses polytropic action with predominant damage to the liver, kidneys and central nervous system. Selenium metal is less toxic.