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What is meant by valency of an element ?...

What is meant by valency of an element ? What is the relationship between the number of valence electron and valency ?

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  1. Which is the outermost shell of sodium atom ?

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  2. Which is the outermost shell of hydrogen atom ?

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  3. What is meant by valency of an element ? What is the relationship betw...

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  4. What is meant by the atomic number (Z) of an element ?

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  5. Atomic number (Z) of some elements are given here.Write down the numbe...

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  6. The number of electrons of some elements is given here. By using it wr...

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  7. Why are the atomic numbers and atomic mass numbers always in whole num...

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  8. Sulphur contains 16 protons and 16 neutrons. What would be its atomic ...

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  9. Define: Isotopes

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  10. State the uses of isotopes

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  11. Define : Moderator.

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  12. Write a note on nuclear reactor.

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  13. Give the scientific reason : All the mass of an atom is concentrated ...

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  14. Give the scientific reason : Atom is electrically neutral.

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  15. Give the scientific reason : Atomic mass number is a whole number.

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  16. Give the scientific reason : Atoms are stable through negatively char...

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  17. Give the scientific reason : In Rutherford's experiment, some alpha p...

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  18. Give the scientific reason : Two electrons in helium atom are placed ...

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  19. Complete the following : Complete the table by putting tick mark in ...

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  20. Complete the table:

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