Home
Class 11
CHEMISTRY
The valency of a representative element ...

The valency of a representative element is either equal to the number of valence electrons or eight minus the number. What is the basis of this rule ?

Text Solution

Verified by Experts

A representative element takes part in a chemical reaction to complete its octet. In this process, the element either loses its valence electrons or gains eight minus valence electrons. Hence, the valency of a representative element is either equal to the number of valence electrons or eight minus this number.
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

The number of valence electrons in Aluminium is

The number of valence electrons in carbon atom is

Number of valence electrons in O^(2-) is :

What are valence electrons ?

Number of valence electrons in Cl^(– ) ion are:

Number of valence electrons in Cl^(– ) ion are:

An element has an atomic number 16. State the number of valence electrons.

Atomic number of an element is 16. State The number of valence electrons in the element

The number of valence electrons for each member of halogen family is equal to six.

For elements ""_19^39X Number of valence electrons

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

    |