Glossary term: 同位素
Description: 原子核由中子和質子組成。原子核中質子的數量被稱為原子序數，它決定了對應的化學元素：具有一個質子的原子是氫原子，具有六個質子的原子是碳原子，依此類推。具有相同數量的質子但中子數量不同的原子核稱為該化學元素的同位素。普通的氫原子核只有一個質子，並沒有中子。一個有一個質子和一個中子的原子核仍然是氫，但稱為重氫，也叫氘。通常，某一元素只有少數同位素是穩定的，其他不穩定的同位素會通過放射性衰變轉化為更穩定的原子核。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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