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Toys and games
1) Devices that are used exclusively for recreation and play. Toys are most often used with children and pets and as a medium of education and development. Toys are not always obvious in their nature. A simple bottle can be considered a toy if an individual uses it for recreational use. 2) Games are structural activities used for physical or psychological education. In most cases, games are recreation. However, games can also be considered work. For example, a professional soccer game is a career to the participants.
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Erbium
Chemistry; General chemistry
Keemiline element järjenumbriga 68 ja lanthanide seeria, Er sümbol. Hõbedase-valge tahke metallist, kui kunstlikult isoleeritud, looduslikud erbium on alati leidnud keemiliste ...
Tseerium
Chemistry; General chemistry
Keemiline element sümbolist Ce ja järjenumbriga 58. On pehme, hõbedase, kõrgtugeva metallist, mille oksüdeerib lihtne õhus. Tseeriumi sai nime kääbus planeedi Ceres, (ise ...
Praseodüüm
Chemistry; General chemistry
On keemiline element järjenumbriga 59 ja sümbol Pr. Praseodüüm on pehme, hõbedase, tempermalmist ja kõrgtugeva metalli lanthanide rühma.
Neodüüm
Chemistry; General chemistry
Keemiline element sümbol põhjamõõtme ja järjenumbriga 60. On pehme hõbedase metallist, et õhu tarnishes. Neodüüm avastati 1885 määratud Austria Carl Auer von Welsbach. On ...