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Why are atomic masses of most of the ele...

Why are atomic masses of most of the elements fractional and not whole numbers?

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Most of the elements have isotopes. Hence, atomic mass is taken as the average value. . Moreover, atomic masses are the relative masses of atoms compared with mass of atom of C-12 taken as 12. Hence, these masses come out to be fractional.
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Statement-I : Mass numbers of most of the elements are fractional. Because Statemen-II Mass numbers are obtained by comparing with the mass number of carbon taken as 12.

Atomic mass of an element is not neccessurity a whole number because

S CHAND IIT JEE FOUNDATION-ATOMIC STRUCTURE-QUESTION BANK-20
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  3. Why are atomic masses of most of the elements fractional and not whole...

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

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

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

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

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

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

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

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

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

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

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

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