関連する話題: 政治家は無給にするべき; A fourth diary in English; Let’s enjoy English! 4

Let's enjoy English!

No.383　13/03/30 23:03
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【What is a radioactive isotope?】

A meaning of the isotope has become clear,but what is a radioactive isotope?😃

《The isotope's stability》

While being the same numbers' protons and the same atomic number,its numbers of neutrons and the amount of mass are different.😃

When being different the amount of mass,its atomic nucleus' stability also changes.The different stability is a key point whether or not it's radioactive.😃

In short,the radioactive isotope is so unstable that its atomic nucleus generates radiation and tries to change into stable other.😃

Even if their atomic numbers are same,some are stable,the others aren't.For example,H3 is radioactive in relation to hydrogen,and C14 is also,concerned carbon.😚

《When its amount of mass is big,it's unstable》

When an atomic has a great amount of mass,it's usually radioactive,so when its atomic number is big,all its isotopes are radioactive isotopes.⚠