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Isotopes differ in...

Isotopes differ in

A

no. of electrons

B

no. of protons

C

no. of neutrons

D

first towards negative plate and then to­ wards positive plate

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To answer the question "Isotopes differ in," we can follow these steps: ### Step 1: Define Isotopes Isotopes are atoms of the same element that have the same atomic number but different mass numbers. This means that they have the same number of protons but a different number of neutrons. ### Step 2: Understand Atomic Number and Mass Number - **Atomic Number (Z)**: This is the number of protons in the nucleus of an atom. Since isotopes belong to the same element, they have the same atomic number. - **Mass Number (A)**: This is the total number of protons and neutrons in the nucleus. Since isotopes have different numbers of neutrons, their mass numbers will be different. ### Step 3: Identify the Difference in Isotopes Since isotopes have the same number of protons (same atomic number) but different mass numbers, the only difference between isotopes is the number of neutrons. ### Step 4: Conclusion Therefore, isotopes differ in the number of neutrons. ### Final Answer Isotopes differ in the number of neutrons. ---
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