Home
Class 11
CHEMISTRY
Why does the fourth period have eighteen...

Why does the fourth period have eighteen and not eight elements?

Promotional Banner

Topper's Solved these Questions

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ICSE|Exercise ESSAY (LONG ANSWER) TYPE QUESTIONS|27 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ICSE|Exercise OBJECTIVE (MULTIPLE CHOICE) TYPE QUESTIONS|54 Videos

  • CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ICSE|Exercise VERY SHORT ANSWER TYPE QUESTIONS|25 Videos

  • CHEMICAL THERMODYNAMICS

    ICSE|Exercise NCERT TEXT-BOOK. EXERCISES|22 Videos

  • ENVIRONMENTAL CHEMISTRY

    ICSE|Exercise NCERT TEXT-BOOK EXERCISE|20 Videos

Similar Questions

Explore conceptually related problems

In the fourth period of the periodic table, how many elements have one or more 4d electrons:

All elements in the third period have

Writen the atomic number of the element present in the fourth period and eighth group of the Modern periodic table.

Name or state with reference to the elements of the modern periodic table. The element from the elements Be and Mg having a lower nuclear charge.

Name or state with reference to the elements of the modern periodic table. The element from the elements fluorine and neon having a higher electron affinity.

Name or state with reference to the elements of the modern periodic table. The element from the elements C, O, N, F, having the maximum nuclear charge.

Name or state with reference to the elements of the modern periodic table. The element, from the elements Li, Na, K, having the least number of electron shells.

Why the third period of Modern periodic table contains 8 elements and not 18 ?

Which of the following does not exhibit the periodicity in properties of the elements?

Name or state with reference to the elements of the modern periodic table. The group whose elements have zero valency.

ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-SHORT ANSWER TYPE QUESTIONS
  1. Define ionisation energy . What is its value for a hydrogen atom ?

    Text Solution

    |

  2. Why is anion larger than its parent atom ?

    Text Solution

    |

  3. Define valency. How does it change across a period and on going down a...

    Text Solution

    |

  4. Why is the second ionisation energy of an element much greater than it...

    Text Solution

    |

  5. Explain what do you understand by screening effect. How does this effe...

    Text Solution

    |

  6. Arrange with explanation the following elements in the increasing orde...

    Text Solution

    |

  7. Why do the alkali metals possess minimum and the noble gases maximum i...

    Text Solution

    |

  8. Why is the ionisation energy of beryllium greater than that of Li and ...

    Text Solution

    |

  9. Why does the ionisation energy decrease on going down a group?

    Text Solution

    |

  10. Among the elements of second period pick out the element with the m...

    Text Solution

    |

  11. Among the elements of second period pick out the element with the mo...

    Text Solution

    |

  12. Among the elements of second period pick out the element with the l...

    Text Solution

    |

  13. Among the elements of second period pick out the element that is th...

    Text Solution

    |

  14. Among the elements of second period pick out the element that is the...

    Text Solution

    |

  15. Why does the fourth period have eighteen and not eight elements?

    Text Solution

    |

  16. The valency of a representative element is either equal to the number ...

    Text Solution

    |

  17. Why do noble gases have positive electron gain enthalpies?

    Text Solution

    |

  18. Two elements X and Y possess the following electronic configuration ? ...

    Text Solution

    |

  19. Why do the melting points decrease in going from NaF to Nal?

    Text Solution

    |

  20. Li(2)CO(3) decomposes on heating but the carbonates of other alkali me...

    Text Solution

    |