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Why does helium exist as He whereas hydr...

Why does helium exist as He whereas hydrogen exists as `H_2`

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Helium has a complete duplet and cannot share electron with another helium atom. Hence, it exists as He. Hydrogen has one electron in the K-shell. It can share this electron with another hydrogen to complete their duplets. Hence, it exists as `H_2`
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S CHAND IIT JEE FOUNDATION-ATOMIC STRUCTURE-QUESTION BANK-20
  1. What are the postulates of Bohr's model of atom? How does Bohr model o...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  17. The statements below are false. For each statement, replace the underl...

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  18. The statements below are false. For each statement, replace the underl...

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  19. The statements below are false. For each statement, replace the underl...

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  20. The statements below are false. For each statement, replace the underl...

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