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Complete the following statements : (a...

Complete the following statements :
(a) Magnesium has 2 valence electrons in the ……… shell
(b) The valency of nitrogen in `N_(2)` molecule is ……..
(c) Isotopes have different mass numbers because their nuclei contain different number of ........
(d) Some boron atoms have mass number 10 and some have mass number 11. These boron atoms with different mass numbers are called ........

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The correct Answer is:
(a) M (b) 3 (c) neutron (d) isotopes
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. What name is given to those isotopes which have unstable nuclei and em...

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  2. Fill in the following blanks in respect of an atom of an element :

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  3. Complete the following statements : (a) Magnesium has 2 valence elec...

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  4. The nucleus of an atom has 5 protons and 6 neutrons. What would be the...

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  5. Write the electronic configuration of the element with atomic number ...

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  6. The atomic number of an element X is 16 (a) Write down the electric ...

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  7. What valencies will be shown by the elements A, B, C, D and E having a...

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  8. Give one use each of the follwing radioactive isotopes : (a) Uranium...

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  9. Explain why .(1)^(3)H and .(2)^(3)He are not considered isotopes

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  10. What is the reason for the different atomic masses of the isotopes of ...

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  11. What is the reason for the identical chemical properties of all the is...

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  12. What is the reason for the slightly different physical properties of a...

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  13. Explain why, the atomic masses of many elements are in fractions and n...

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  14. Which of the following are isotopes and which are isobars ? Argon, D...

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  15. Hydrogen has three isotopes written as : .(1)^(1)H,.(1)^(2)H,.(1)^(3...

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  16. Given that the percentage abundance of the isotope .(10)^(20)N is 90 %...

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  17. What are isobars ? Explain with an example.

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  18. For the symbol H,D and T tabulate three sub-atomic particles found in ...

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  19. An element has Z = 7. What is the valency of the element ? Also name t...

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  20. (a) What are valence electrons ? Where are valence electrons situated ...

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