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Atomic number of chlorine is 17. What wi...

Atomic number of chlorine is 17. What will be the atomic number of chloride ion `(Cl^(-))` and why?

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Atomic number is given by the number of protons in the nucleus, When Cl changes into `Cl^(-)` ion, the number of electrons increases but number of protons remains the same. Hence, atomic number does not change. It remains equal to 17.
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S CHAND IIT JEE FOUNDATION-ATOMIC STRUCTURE-QUESTION BANK-20
  1. How was the stability of atom explained by Bohr's model?

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  2. Why is atomic number always calculated from the number of protons in t...

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  3. Atomic number of chlorine is 17. What will be the atomic number of chl...

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  4. Atomic number of sodium is 11. What will be the atomic number of sodiu...

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  5. What are the postulates of Bohr's model of atom? How does Bohr model o...

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  6. Why are atomic masses of most of the elements fractional and not whole...

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  7. Why does helium exist as He whereas hydrogen exists as H2

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  8. Name the three isotopes of hydrogen. How do they differ from each othe...

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  9. M-shell can have up to 18 electrons, then why does potassium (Atomic n...

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  10. What are the different isotopes of oxygen? Write their symbols and dra...

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  11. As we move away from the nucleus, in atom the potential energy of elec...

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  12. Could a nucleus of more than one proton but no neutrons exist? Explain...

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  13. The valence shell of an element ""(20)^(40)X is the 3rd shell.

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  14. According to Bohr's atomic model, electrons revolve around the nucleus...

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  15. The mass number of the atom of an element is the sum of the number of ...

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  16. The maximum number of electrons present in the 5th shell is 32. (True ...

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  17. State True or False Electrons present in the first orbit cannot lose...

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  18. J.J. Thomson proposed that the nucleus of an atom contains only nucleu...

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  19. A neutron is formed by an electron and a proton combining together. Th...

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  20. The mass of an electron is about (1)/(2000) times that of proton.

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