radioactive decay
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
The natural process in which an unstable atomic nucleus loses energy by releasing radiation, gradually turning into a different, more stable element.
Test yourself
Which word fits the gap? "Scientists can estimate the age of ancient bones by measuring _____ in the surrounding rock."
Answer: radioactive decay
In your own words, what does "radioactive decay" mean?
The natural process in which an unstable atomic nucleus loses energy by releasing radiation, gradually turning into a different, more stable element.
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