isotope
Pronunciation
Noun
B1 Intermediate
Quick answer
One of two or more forms of a chemical element that have the same number of protons but a different number of neutrons.
Test yourself
Which word fits the gap? "Carbon-14 is a radioactive _____ used to date ancient organic remains."
Answer: isotope
In your own words, what does "isotope" mean?
One of two or more forms of a chemical element that have the same number of protons but a different number of neutrons.
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