Se+-+Selenium

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Name:selenium Symbol:se Atomic Number:34 Atomic Mass:79.96(3) Standard State:solid at 298 Group name:chalcogen Period in Periodic Table:4 Color:grey, metallic luster Classification: non-metallic

Isolation is not usually nessesary. Although selenium is toxic in large doses, selenium is an essential micronutrient for animals. Some plants may accumulate selenium as a deffense to being eaten by animals, but other plants such as locoweed require selenium,and there growth indicates the presenceof selenium in soil. Specific kinds of plants are considered indicators of high selenium content in the soil. They need big doses doses of selenium in so they can thrive. selenium is an essential trace element, it is toxic if too much is taken.