양성자 수는 같으나 중성자 수가 달라 원자 질량이 서로 다른 같은 원소의 여러 형태.
Any of two or more forms of a chemical element that have the same number of protons but a different number of neutrons in their nuclei, resulting in different atomic masses.
예문:
"Carbon-12 and carbon-14 are isotopes of the element carbon used in different scientific applications."
"The researchers used a stable isotope of nitrogen to track nutrient uptake in the plants."
"Radioactive isotopes are frequently employed in medical imaging and cancer treatment."