注目の話題: 馬鹿な子に「馬鹿」と言われたくない; 助けてください、もう無理です; マッチングアプリで知り合って、、

A diary of a heretic in English

No.408　11/07/24 19:23
ｽﾁｬﾗｶ一郎 ( 50代 ♂ Oe38xe ) あ+あ-

【Kinds of chemical element】

We can refer to how many kinds of chemical element there are easily.

It's said from the atomic number 1,a hydrogen,to its number 92,uran are stable in the natural world on earth.

However,technetium,its atomic number is 43,is unstable chemical element, and it may have been in the world when the earth was created, but the technetium has been broken during the history of the earth of 4.8 billion years,so none of them are in the natural world at present.

Contrary to it,a transuranic element 超ｳﾗﾝ元素 which hadn't been consider to be in the natural world at all,is discovered in the natural world,though it's small amount.

Roughly speaking,there are 90 kinds of chemical element in the natural world.

However,the chemical elements which exist on earth aren't always limited in the natural world.

There are some other artificial chemical elements created by nuclear reactors.We call the artificial ones the transuranic elements.