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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
- Complete the following statements : (a) Magnesium has 2 valence elec...
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- The nucleus of an atom has 5 protons and 6 neutrons. What would be the...
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- Write the electronic configuration of the element with atomic number ...
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- The atomic number of an element X is 16 (a) Write down the electric ...
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- What valencies will be shown by the elements A, B, C, D and E having a...
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- Give one use each of the follwing radioactive isotopes : (a) Uranium...
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- Explain why .(1)^(3)H and .(2)^(3)He are not considered isotopes
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- What is the reason for the different atomic masses of the isotopes of ...
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- What is the reason for the identical chemical properties of all the is...
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- What is the reason for the slightly different physical properties of a...
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- Explain why, the atomic masses of many elements are in fractions and n...
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- Which of the following are isotopes and which are isobars ? Argon, D...
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- Hydrogen has three isotopes written as : .(1)^(1)H,.(1)^(2)H,.(1)^(3...
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- Given that the percentage abundance of the isotope .(10)^(20)N is 90 %...
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- What are isobars ? Explain with an example.
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- For the symbol H,D and T tabulate three sub-atomic particles found in ...
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- An element has Z = 7. What is the valency of the element ? Also name t...
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- (a) What are valence electrons ? Where are valence electrons situated ...
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- (a) What are isotopes ? Explain by giving an example (b) Give one si...
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- (a) What are radioactive isotopes ? Give two examples of radioactive i...
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