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Which of the following is true about isotopes?

8. Which of the following is true about isotopes?

1. In chemistry, an isotope is an atom with the same number of protons but with a different number of neutrons.
2. In chemistry, an isotope is an atom with the same number of neutrons but with a different number of protons.
3. None
4. Both A and B

Answer

The correct answer is: A) In chemistry, an isotope is an atom with the same number of protons but with a different number of neutrons.

Explanation

Isotopes are elements that have the same number of protons but differ in the number of neutrons in their atomic nuclei. Carbon-12 (12C) and carbon-14 (14C) are two isotopes of carbon, for example. Both have six protons, but they differ in the number of neutrons.