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What were the criteria used by Mendeléev...

What were the criteria used by Mendeléev in creating his Periodic Table?

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Mendeleev used two criteria in creating his periodic table:
(i) increasing atomic masses, and
(ii) grouping together of elemetns having similar chemical properties.
Mendeleev took the formulae of the oxides and hydrides formed by the elements as the basic chemical properties of elements for their classification in the form a periodic table.
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(a) Why do we classify elements ? (b) What were the two criteria used by Mendeleev in creating his Periodic Table ? (c ) Why did Mendeleev leave some gaps in his Periodic Table? (d) In Mendeleev's Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon? (e ) Would you place the two isotopes of chlorine , Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same ? Justify your answer.

(a) Why do we classify elements? (b) What were the two criteria used by Mendeleev to classifiy the elements in his periodic table? (c) Why did Mendeleev leave some gaps in his periodic table? (d) In Mendeleev's periodic table, why was there no mention of noble gases like helium neon and argon? (e) Would you place the two isotopes of chlorine, Cl-35 and Cl-27 in different slots because of their different atomic masses or in the same slot because theri chemical properties are the same? Justify your answer.

Besides gallium, which other elements have since been discovered that were left by Mendeléev in his Periodic Table? (any two)

LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Use Mendeléev’s Periodic Table to predict the formulae for the oxides ...

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  2. Besides gallium, which other elements have since been discovered that ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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