What are isotopes defined as?

Type: MCQ • Marks: 1

A. Atoms with equal neutrons and electrons

B. Atoms of different elements with same mass number

C. Ions of radioactive elements

D. Atoms of the same element having the same atomic number but different mass numbers

Explanation

Isotopes share atomic number Z but differ in neutron counts.

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Class 9th Science (MCQ)

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