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An element X has a mass number 4 and ato...

An element X has a mass number 4 and atomic number 2. Write the valency of this element.

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The electronic configuration : K(2).Since the K shell is filled the valecny of 'X' = zero
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DINESH PUBLICATION-STRUCTURE OF ATOM -Very Short Answer Questions
  1. The atom of an element has electronic configuration 2,8,6.Does it gai...

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  2. Do the elelment overset(3)underset(1)X and overset(3)underset(2)Y repr...

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  3. An element X has a mass number 4 and atomic number 2. Write the valenc...

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  4. Name the particles which actually determine the mass of an atom.

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  5. J. chadwick discovered a sub atomic particle which has no charge but h...

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  6. The K and L shells of an atom are completely filled. Find the number o...

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  7. Who discovered protons?

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  8. What are valence shell and valence electrons?

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  9. The total number of nucleons in the atoms of clacium and argon is 40 ...

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  10. Atom of an element has one proton one electron and no neutron .Name th...

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  11. An element has 2 electrons in the M shell. What is the atomic number o...

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  12. Write the names of three elementary paritcles which constitute an atom...

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  13. Identify the most stable atom from the following .Alson given the reas...

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  14. what are the constituents of cathode rays?

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  15. What is the mass of an electron?

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  16. Do protons and electrons have same mass?

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  17. How are the radii of the nucleus and of an atom related to each other ...

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  18. What is the maximum number of electrons which can be present in M shel...

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  19. What is common in the different isotopes of an element?

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  20. what is the e/m value of an electron?

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