Home
Class 10
CHEMISTRY
(a) In the modern Periodic Table, why do...

(a) In the modern Periodic Table, why does cobalt with higher atomic mass of 58.93 appear before nickel having lower atomic mass of 58.71?
(b) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

Text Solution

Verified by Experts

The correct Answer is:
(a) Because modern periodic table arranges the elements according to the increasing atomic numbers. And the atomic number of cobalt (27) comes first whereas the atomic number of nickel (28) comes later
NA
Promotional Banner

Topper's Solved these Questions

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise SHORT ANSWER TYPE|8 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise LONG ANSWER TYPE|3 Videos

  • PERIODIC CLASSIFICATION OF ELEMENTS

    LAKHMIR SINGH & MANJIT KAUR|Exercise VERY SHORT ANSWER TYPE|6 Videos

  • METALS AND NON-METALS

    LAKHMIR SINGH & MANJIT KAUR|Exercise Short Answer Type Qustions|1 Videos

  • TEST PAPER 1

    LAKHMIR SINGH & MANJIT KAUR|Exercise Section B|4 Videos

Similar Questions

Explore conceptually related problems

In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

Position of element, having atomic number 25, in the modern periodic table.

Why are isotopes of an element having different atomic masses placed at the same position in the Periodic Table?

In the modern periodic table, the period indicates the value of a. atomic number b.atomic mass c.principal quantum number d.azimuthal quantum number

The two isotopes of chlorine have atomic mass 35 u and 37 u. Should they be placed in separate slots in the periodic table ?

A and B belong to same group of periodic table. A has higher atomic number than B . Which will have lower ionisation energy and why?

LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. (a) How does the tendency to lose electrons change as we go down in gr...

    Text Solution

    |

  2. (a) Why does the side of the atoms progressively become smaller when w...

    Text Solution

    |

  3. (a) In the modern Periodic Table, why does cobalt with higher atomic m...

    Text Solution

    |

  4. (a) Explain why the first period of the modern periodic table has only...

    Text Solution

    |

  5. (a) What is a group in the periodic table in which part of a group wou...

    Text Solution

    |

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

    Text Solution

    |

  7. The electronic configuration of the atom of an element X is 2,8,4. In ...

    Text Solution

    |

  8. The atomic number of an element is 20. In modern periodic table, this ...

    Text Solution

    |

  9. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and ...

    Text Solution

    |

  10. The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 ...

    Text Solution

    |

  11. Which of the following elements would lose an electron easily ?

    Text Solution

    |

  12. Which of the following elements does not lose an electron easily ?

    Text Solution

    |

  13. Where would you locate the element with electronic configuration 2,8 i...

    Text Solution

    |

  14. An element which is an essential constituent of all organic compounds ...

    Text Solution

    |

  15. Which of the following is the valence shell for the elements of second...

    Text Solution

    |

  16. The element which has the maximum number of valence electrons is:

    Text Solution

    |

  17. The correct increasing order of the atomic radii of the elements oxyge...

    Text Solution

    |

  18. The atomic numbers of the elements Na, Mg, K and Ca are 11,12,19 and 2...

    Text Solution

    |

  19. Which of the following are the correct characteristics of isotopes of ...

    Text Solution

    |

  20. The correct formula of the oxide of Eka-aluminium element predicted by...

    Text Solution

    |