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Why do you think the noble gases are pla...

Why do you think the noble gases are placed in a separate group?

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The noble gases are placed in a separate group because they are chemically very inert or unreactive (having completely filled outermost electron shells).
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Besides gallium, which other elements have since been discovered that ...

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  2. What were the criteria used by Mendeléev in creating his Periodic Tabl...

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  3. Why do you think the noble gases are placed in a separate group?

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  4. How could the Modern Periodic Table remove various anomalies of Mendel...

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  5. Name two elements you would expect to show chemical reactions similar ...

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  6. Name (a) three elements that have a single electron in their outermo...

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  7. (a) Lithium, sodium, potassium are all metals that react with water to...

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  8. In the Modern Periodic Table, which are the metals among the first ten...

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  9. By considering their position in the Periodic Table, which one of the ...

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  10. Which of the following statements is not a correct statement about the...

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  11. Element X forms a chloride with the formula XCl(2), which is a solid w...

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  12. Which element has (a) two shells, both of which are completely filled...

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  13. (a) What property do all elements in the same column of the Periodic T...

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  14. The atom of an element has electronic configutation 2,8,7. (a) What ...

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  15. The positions of three elements A,B and C in the periodic table are sh...

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  16. The positions of three elements A,B and C in the periodic table are sh...

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  17. Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to...

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  18. How does the electronic configuration of an atom relate to its positio...

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  19. In the modern periodic table calcium (atomic number 20) is surrounded ...

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  20. Compare and contrast the arrangement of elements in Mendeléev’s Period...

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