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Why is atomic number always calculated f...

Why is atomic number always calculated from the number of protons in the nucleus and not from the number of electrons present in the extra nuclear part?

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When atoms change into ions, the number of electrons changes but number of protons remains the same. Hence, atomic number is always calculated from the number of protons present in the nucleus and not from the number of electrons.
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S CHAND IIT JEE FOUNDATION-ATOMIC STRUCTURE-QUESTION BANK-20
  1. Discovery Of Neutrons is by ?

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  2. How was the stability of atom explained by Bohr's model?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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