the radioactive isotope of actinium, 22789ac, having a half-life of 21.7 years

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the radioactive isotope of actinium, 22789ac, having a half-life of 21.7 years teriminin İngilizce İngilizce sözlükte anlamı

The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years.
radioactinium