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Explain why elements have fractional ato...

Explain why elements have fractional atomic masses ?

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MBD-STRCTURE OF ATOM-Example
  1. State three ways by which a proton differs from an electron.

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  2. What are isotopes ? Give two uses of isotopes. Name the isotopes of hy...

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  3. Explain why elements have fractional atomic masses ?

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  4. What are isobars ? Give examples

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  5. Sulphur has an atomic number 16 and a mass of 32. State the number of ...

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  6. Write down the electronic configuration of the following : "13^27X

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  7. Write down the electronic configuration of the following : "17^35X

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  8. Give the important properties or characteristics of isotopes.

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  9. An atom of the element is represented as "23^61X ? What does the numer...

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  10. An atom of the element is represented as "23^61X ? What does the numer...

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  11. An atom of the element is represented as "23^61X ? What is the number ...

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  12. The atom of an element is made up of 4 protons, 5 neutrons and 4 elect...

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  13. Calculate the number of neutrons in the following elements :"1^3H

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  14. Calculate the number of neutrons in the following elements :"17^37Cl

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  15. Calculate the number of neutrons in the following elements :"18^40Ar

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  16. Give two conditions under which cathode rays are produced.

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  17. The electronic configuration of P (Z=15) is 2, 8, 5, why is the valen...

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  18. What information is conveyed by the statement that the mass number of ...

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  19. Is it possible for an atom to have 12 protons and 13 electrons ? Expla...

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  20. Give the important isotopes of hydrogen,carbon, oxygen and chlorine. I...

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