注目の話題: 海外の人に原爆について教える。; 独身、恋愛経験なし。これから何を目標に生きたらいいか？; 離婚し30年会ってない父親に会う場合

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No.396　13/04/08 00:08
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【What kinds of atoms are there?】

《Chemical elements in the natural world》

However,technetinu of which atomic number is 43 was very unstable.It used to exist at the time when the earth was born,but it ended up breaking during the history of 4.8 billion years,so the technetinu doesn't exist in the natural world at all at present.😃

On the other hand,we have never thought what is called chemical element of super uranium existed in the natural world.Though it's small amount,we find it exists in the natural world.😲

As a result,roughly speaking,kinds of chemical elements in the natural world are some 90,accoring to my crib あんちょこ『知っておきたい放射能の基礎知識』😳

《Chemical element of super uranium》

However,except for the chemical elements in the natural world,there are other artificial ones which are created in an atomic reactor.😃

In general,we call them the chemical elements of super uranium.If including those,there are 118 kinds of the chemical elements on the earth.😃