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Which element has: A total of two shell...

Which element has: A total of two shells with three electrons in its valence shell?

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MBD-PERIODIC CLASSIFICATION OF ELKHOENTS-EXAMPLE
  1. Which element has: The electronic configuration 2, 8, 2?

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  2. Which element has: A total of three shells, with four electrons in it...

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  3. Which element has: A total of two shells with three electrons in its ...

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  4. Which element has: Twice as many electrons in its second shell as in ...

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  5. What property do all elements in the same column of the periodic table...

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  6. What property do all elements in the same column of the periodic tabl...

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  7. An atom has electronic configuration 2,8,7. What is the atomic number ...

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  8. An atom has electronic configuration 2,8,7. To which of the following...

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  9. The position of three elements A, B and C in the periodic table are as...

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  10. The position of three elements A, B and C in the periodic table are a...

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  11. The position of three elements A, B and C in the periodic table are a...

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  12. The position of three elements A, B and C in the periodic table are as...

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

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

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  15. In the modern periodic table, calcium (atomic number20) is surrounded ...

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  16. Compare and contrast the arrangement of elements in mendeleev's period...

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  17. What do you understand by Doberiner's traids? Give some examples to su...

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  18. What was Doberiner's basis of clasifying elements?

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  19. Give a brief discussion of the Mendeleev's classification of the eleme...

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  20. Why do we classify elements?

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