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同じ元素であるが、原子核の(ア)の数が異なるものを(イ)と呼ぶ。また(イ)の中で、壊変の際に放射線を放つものを(ウ)と呼ぶ
(ア)(イ)(ウ)に入る語句の組み合わせとして正しいものを選びなさい。
The same element which has a different number of (ア) in its nucleus is named (イ). And among them, (イ) which shows radioactive decay is called (ウ).