Home
Class 10
CHEMISTRY
Elements A, B, C, and D have atomic numb...

Elements A, B, C, and D have atomic numbers 1, 8, 11, and 19 respectively. Choose the odd element and give reason for your answer.

Text Solution

Verified by Experts

Electronic configurations are: `A to 1 , B to 2 , 6 , C to 2, 8 , 1`,  and `D to 2,8,8,1`. Elements A, C, and D have one valence electron each while B has 8 - 6 = 2 valence electrons. Hence, B is the odd element.
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)|69 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (LONG ANSWER (LA) TYPE QUESTIONS)|6 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    ZEN PUBLICATION|Exercise ZEE ADDITIONAL QUESTIONS SECTIONS (MULTIPLE CHOICE QUESTIONS)|35 Videos

  • METALS AND NON METALS

    ZEN PUBLICATION|Exercise ZEN ADDITIONAL QUESTIONS SECTION (LONG ANSWER [LA] TYPE 2 QUESTIONS)|14 Videos

Similar Questions

Explore conceptually related problems

Four elements A, B, C and D have atomic numbers 12, 13, 14 and 15 respectively. Answer the following questions giving reasons : (i) What is the number of valence electrons and valency of D? (ii) Which of them will have largest atomic radii ? (iii) Which of these elements will form the most basic oxide ?

Two elements X and Y have atomic number 3 and 5 respectively, give the formula of their chlorides.

Three elements X, Y and Z have atomic numbers 7, 10 and 14 respectively. (i) Identify the group number of these elements in the periodic table. (ii) Mention one unique feature each of elements Y and Z. (iii) Which of the above two elements belong to the same period ?

Three elements 'X', 'Y' and 'Z' have atomic numbers 7, 8 and 9 respectively. (i) State their positions (Group number and period number both) in the Modern Periodic Table. (ii) Arrange these elements in the decreasing order of their atomic radii. (iii) Write the formula of the compound formed when 'X' combines with 'Z'.

The atomic numbers of five elements A, B, C, D and E are 6, 8, 3, 7 and 9 respectively. (i) Which is the element having the highest electropositivity among these elements ? Why? (ii) Which is the element having the least metallic character among these elements ? Why? (iii) What is your conclusion about the relationship between metallic character and electropositivity of an element ?

In a triad of three elements A, B, and C, the atomic mass of A and B are 80 and 120 respectively. Find the atomic mass of element C.

a] What are metalloids? Write any two examples. b] Given below are some of the elements of the first group: Li, Na, K (their atomic numbers are 3, 11, and 19 respectively and they belong to 2nd, 3rd, and 4th period respectively). Arrange them in the decreasing order of their metallic character.

Elements A, B, C, D, E, F, G, H, I, J and have atomic masses 13, 3, 97, 25, 7, 35, 9, 30, 50, and 19 respectively. According to law of octaves, which elements would have similar properties? Explain.

Observe the given table and question: answer the following {:("Elements", A, B, C, D, E),("Atomic number", 11,4,2,7,19):} Identify the two elements that belong to the same period and the two elements that belong to the same group. Give reason for your conclusion.

The atomic radii of three elements A, B and C of a periodic table are 186 pm, 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (VERY SHORT ANSWER (VSA) TYPE QUESTIONS)
  1. Write the atomic numbers of two elements X and Y having electronic con...

    Text Solution

    |

  2. Account for the following: Elements of group 17 are monovalent.

    Text Solution

    |

  3. Account for the following: Elements of group 18 are zerovalent.

    Text Solution

    |

  4. Elements A, B, C, and D have atomic numbers 1, 8, 11, and 19 respectiv...

    Text Solution

    |

  5. Out of the two elements X and Y which has a bigger atomic radius? (i...

    Text Solution

    |

  6. Out of the two elements, potassium and sodium, which one can lose elec...

    Text Solution

    |

  7. Mention the type of compounds formed between group 1 and group 17 elem...

    Text Solution

    |

  8. Write the number of vertical columns in the periodic table. What are t...

    Text Solution

    |

  9. Write the number of horizontal rows in the modern periodic table. What...

    Text Solution

    |

  10. Predict the maximum number of valence electrons possible for atoms in ...

    Text Solution

    |

  11. What is the nature of oxides formed by most of p - block elements ?

    Text Solution

    |

  12. Explain the acidic character of oxide of elements down a group and acr...

    Text Solution

    |

  13. Why hydrogen should be placed in group I ?

    Text Solution

    |

  14. Out of Li and K which has strong metallic character?

    Text Solution

    |

  15. List any two properties of the elements belonging to the first group m...

    Text Solution

    |

  16. Write the formula used to determine the maximum numbers of electrons w...

    Text Solution

    |

  17. Name the element and its valency which is having electronic configurat...

    Text Solution

    |

  18. Lithium, sodium and potassium form a Dobereiner's triad. The atomic ma...

    Text Solution

    |

  19. What do you mean by valency?

    Text Solution

    |

  20. Sodium and potassium are placed in the same group of modern periodic t...

    Text Solution

    |