Home
Class 9
CHEMISTRY
Why did Mendeleev left gaps in his perio...

Why did Mendeleev left gaps in his periodic table ?

Text Solution

Verified by Experts

Mendeleev left some gaps in his periodic table of elements for the unknown elements at that time. For e.g., Mendeleev discovered eka-silicon with atomic mass of 72, which was later named Germanium with atomic mass 72.6.
Promotional Banner

Topper's Solved these Questions

  • THE PERIODIC TABLE

    ICSE|Exercise TOPIC 1 Modern Periodic Table and its Periodicity (3 Marks Questions ) |33 Videos

  • THE PERIODIC TABLE

    ICSE|Exercise TOPIC 1 Modern Periodic Table and its Periodicity (5 Marks Questions ) |44 Videos

  • THE PERIODIC TABLE

    ICSE|Exercise TOPIC 1 Modern Periodic Table and its Periodicity (1 Mark Questions ) |25 Videos

  • THE LANGUAGE OF CHEMISTRY

    ICSE|Exercise EXCERCISE 1(C ) (Correct the following statement)|21 Videos

  • WATER

    ICSE|Exercise TOPIC 2 Solution (5 MARKS QUESTIONS)|5 Videos

Similar Questions

Explore conceptually related problems

(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.

............. (Mendeleev / Moseley) left gaps in the periodic table for the undiscovered elements.

What physical and chemical properties of elements were used by Mendeleev in creating his periodic table? List two observations which posed a challenge to Mendeleev’s Periodic Law.

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

Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?

Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?

The property used by Mendeleev to classify the elements in his periodic table is "________" .

Which group of elements was missing from Mendeleev.s original periodic table ?

The number of elements known in Mendeleev's presented periodic table is:

How many periods and groups were present in Mendeleev's original periodic table?

ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (2 Marks Questions )
  1. Why did Mendeleev left gaps in his periodic table ?

    Text Solution

    |

  2. Three elements of Dobereiner.s triad are X, Y & Z. If the atomic mass ...

    Text Solution

    |

  3. Provide reason for each of the following: Discarding the law of triad.

    Text Solution

    |

  4. Did Dobereiner's triads also exist in the columns of Newlands' octaves...

    Text Solution

    |

  5. Predict the formula of hydrides of carbon and silicon using Mendeleev'...

    Text Solution

    |

  6. The atomic number of an element is more important to the chemist than ...

    Text Solution

    |

  7. Consider the following elements: Be, Li, Na, Ca,K. Name the elements o...

    Text Solution

    |

  8. Consider the following elements: Be, Li, Na, Ca,K. Name the elements o...

    Text Solution

    |

  9. State modern periodic law of classification of elements.

    Text Solution

    |

  10. How many periods and groups are there in the modern periodic table ?

    Text Solution

    |

  11. What is the main characteristic of the last elements in the periods of...

    Text Solution

    |

  12. What is meant by a group in the periodic table?

    Text Solution

    |

  13. What is meant in the periodic table by a period ?

    Text Solution

    |

  14. What is the number of elements in the 1^(st) period of the modern peri...

    Text Solution

    |

  15. What is the number of elements in the 3^(rd) period of the modern peri...

    Text Solution

    |

  16. Sodium and aluminium have atomic numbers 11 and 13, respectively. They...

    Text Solution

    |

  17. Within a group where would you expect to find the element with (A) ...

    Text Solution

    |

  18. Mention the part of group where the elements show: Big atomic size

    Text Solution

    |

  19. The electronic configuration of element is ""35^17T is 2,8,7 Is it a...

    Text Solution

    |

  20. Write electronic configuration of element underset(17)overset(35)""T....

    Text Solution

    |