Science
Isotopes
समस्थानिक
In Class 9 Science, the topic Isotopes from “Journey Inside the Atom” explains how atoms of the same element can have the same number of protons but different numbers of neutrons. Students learn to identify atomic number and mass number, write isotope notation, and compare isotopes such as hydrogen-1, hydrogen-2, hydrogen-3, and carbon-12 and carbon-14. The topic also introduces why some isotopes are stable while others are radioactive, along with practical uses of isotopes in medicine, agriculture, industry, and scientific dating.
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Practice questions are not available for this topic yet. We plan to add questions with clear explanations soon. You can keep practising other topics in the meantime.
- Class / subject
- 9 · Science
- Chapter
- Journey Inside the Atom
- Topic
- Isotopes
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