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Complete the table on the basis of infor...

Complete the table on the basis of information available in the symbols given below.
(a) `""_(17)^(35)Cl` (b) `""_(6)^(12)C` (c) `""_(35)^(81)Br`
`{:("Element", n_(p), n_(n)):}`

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The symbol for different elements are given below. Identify the elements N

If n is a positive integer then ^nC_r+^nC_(r+1)=^(n+1)^C_(r+1) Also coefficient of x^r in the expansion of (1+x)^n=^nC_r. In an identity in x, coefficient of similar powers of x on the two sides re equal. On the basis of above information answer the following question: If n is a positive integer then ^nC_n+^(n+1)C_n+^(n+2)C_n+.....+^(n+k)C_n= (A) ^(n+k+1)C_(n+2) (B) ^(n+k+1)C_(n+1) (C) ^(n+k+1)C_k (D) ^(n+k+1)C_(n-2)

The symbol for different elements are given below. Identify the elements Be N O

C_(6)H_(5)N_(2)Cl + CuCN to C_(6)H_(5)CN + N_(2) + CuCl is

The coefficient of friction between the blocks is 0.5 . Find the acceleration of each block if F is (a) 21 N ,(b) 35 N and (c ) 40 N .

NCERT EXEMPLAR-STRUCTURE OF THE ATOM-Structure Of The Atom
  1. One electron is present in the outermost shell of the atom of an eleme...

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  2. Write down the electron distribution of chlorine atom. How many electr...

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  3. In the atom of an element X, 6 electrons are present in the outermost ...

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  4. What information do you get from the figure about the atomic number, m...

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  5. In response to a question, a student stated that in an atom, the numbe...

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  6. Calculate the number of neutrons present in the nucleus of an element ...

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  7. Match the names of the Scientists given in Column A with their contrib...

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  8. The atomic number of calcium and argon are 20 and 18 respectively, but...

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  9. Complete the table on the basis of information available in the symbol...

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  10. Helium atom has 2 electrons in its valence shell but its valency is no...

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  11. Fill in the blanks in the following statements. (a) Rutherford's alp...

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

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  13. Why do helium, neon and argon have a zero valency?

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  14. The ratio of the radii of hydrogen atom and its nucleus is ~ 10^(5). ...

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  15. Enlist the conclusions drawn by Rutherford from his alpha-ray scatteri...

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  16. In what way is the Rutherford's atomic model different from that of Th...

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  17. What were the drawbacks of Rutherford's model of an atom?

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  18. What are the postulates of Bohr's model of an atom?

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  19. Show diagramatically the electron distributions in a sodium atom and a...

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  20. In the gold foil experiment of Geiger and Marsden, that paved the way ...

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