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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 atomic masses of the elements as the criteria for creating his periodic table. In this table, the elements were arranged in order of increasing atomic mass.
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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)

MTG IIT JEE FOUNDATION-PERIODIC CLASSIFICATION OF ELEMENTS-NCERT Section
  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: three elements that have a single electron in their outermost sh...

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  8. Name: two elements that have two electrons in their outermost shells.

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  9. Name: three elements with filled outermost shells.

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  10. Lithium, sodium, potassium are all metals that react with water to lib...

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  11. Helium is an unreactive gas and neon is a gas of extremely low reactiv...

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

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

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

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

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  16. which element has two shells, both of which are completely filled wi...

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  17. which element has the electronic configuration 2, 8, 2?

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  18. which element has a total of three shells, with four electrons in it...

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  19. which element has a total of two shells, with three electrons in its...

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  20. which element has Twice as many electrons in its second shell as in ...

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