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CBSE › Class 9 › Science › Journey Inside the Atom (Class 9 NCERT New)
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1. Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?

2. Which scientist gave the concept of fixed energy levels around the nucleus?

3. What prevents an atom from being collapsed?

4. Which radioactive element is used in the treatment of cancer?

5. Why do most of the elements try to participate in the chemical combinations?i. To gain more electronsii. To achieve Inert Gas configurationiii. To complete their octetiv. To complete their inner shells

6. The isotope deuterium of hydrogen has

7. The atomic number of sodium is 11 and its mass number is 23. It has

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