Home
Class 11
CHEMISTRY
Atomic mass of an element is not necces...

Atomic mass of an element is not neccessurity a whole number because

A

It contains electrons ,photons and neutrons

B

It excists in allotropic forms

C

It containts isotopes

D

Atom are no longer indivisible

Text Solution

Verified by Experts

The correct Answer is:
C
Atomic number
` = ((% "Abundance" ) xx ("isotope") + % "of" ("isotope")_(2))/(100)`
Promotional Banner

Topper's Solved these Questions

  • ATOMIC STRUCTURE

    CENGAGE CHEMISTRY|Exercise Exercises Assertion And Reason|21 Videos

  • ATOMIC STRUCTURE

    CENGAGE CHEMISTRY|Exercise Exercises Integer|11 Videos

  • ATOMIC STRUCTURE

    CENGAGE CHEMISTRY|Exercise Exercises Multiple Correct|45 Videos

  • APPENDIX - INORGANIC VOLUME 1

    CENGAGE CHEMISTRY|Exercise chapter-7 Single correct answer|1 Videos

  • CHEMICAL BONDING AND MOLECULAR STRUCTURE

    CENGAGE CHEMISTRY|Exercise Archives Subjective|15 Videos

Similar Questions

Explore conceptually related problems

The relative atomic masses of many elements are not whole numbers because

Explain why, the atomic masses of many elements are in fractions and not whole numbers.

Atomic mass number of an element is 232 and its atomic number is 90 . The end product of this radiaoctive element is an isotope of lead (atomic mass 208 and atomic number 82 .) The number of alpha -and beta -particles emitted are.

The atomic number of an element is 5 and mass number is 11. Find the number of electrons, protons and neutrons present in an atom of it. How can this element be represented ?

Knowledge Check

  • The relative atomic masses of many elements are not whole numbers because

    A
    they can’t be determined very accurately
    B
    the atoms ionize during the determinatio
    C
    of the existence of isotopes
    D
    of the presence of impurities

  • The relative atomic masses of many elements are not whole numbers because

    A
    they cannot be determined very accurately
    B
    the atoms ionize during the determinations
    C
    of the existence of isotopes
    D
    of the presence of impurities

  • The mass of an atom is due to the masses of protons and neutrons in the nucleus. The relative masses of protons and neutrons are almost equal to one. Therefore, the atomic mass of an element should be nearly a whole number. But in many cases the atomic masses are fractional. The main reason for these fractional atomic masses is that these elements occur in nature as a mixture of several isotopes. The atomic mass of an element is the average of the atomic masses of these isotopes in the ratio of their proportion of occurrence. The fractional atomic masses of elements are due to the existence of

    A
    isotopes having different masses
    B
    diagonal relationship
    C
    equal number of electrons and protons
    D
    none of these.
    • CENGAGE CHEMISTRY-ATOMIC STRUCTURE-Exercises Single Correct
    1. Atomic mass of an element is not neccessurity a whole number because

      Text Solution

      |

    2. Which of the following properties of an element is a whole number ?

      Text Solution

      |

    3. Which of the following sets of quantum number is allowable

      Text Solution

      |

    4. Which of the following is associated will the orbital desigrated by n...

      Text Solution

      |

    5. An isotone of (32)Ge^(36) is i. (32)Ge^(77) ii. (33)As^(77) iii. (3...

      Text Solution

      |

    6. The transition of electron in if atom that will emit maximum energy is

      Text Solution

      |

    7. The limiting line Balmer series will have a frequency of

      Text Solution

      |

    8. The fundamental particle which are responsible for leping nucless to...

      Text Solution

      |

    9. Which of the following is not a characterists of plank's quantum theo...

      Text Solution

      |

    10. Which of the following configuration is incorrect ?

      Text Solution

      |

    11. Which of the following set of quantum number is an impossible arrange...

      Text Solution

      |

    12. Which of the following statement about quantum number is wrong ?

      Text Solution

      |

    13. Bohr's model of atom is not in agrement with

      Text Solution

      |

    14. If the energy of electron in H atom is given by expression - 1312 n^(...

      Text Solution

      |

    15. For which of the following electron distribution in ground state the (...

      Text Solution

      |

    16. Which of the following orbital does not same ?

      Text Solution

      |

    17. Which of the following sets of quantum number is not possible

      Text Solution

      |

    18. The possible sub-shell in n = 3 energy shell are

      Text Solution

      |

    19. In the Schrodingers wave equation spi repressents

      Text Solution

      |

    20. Heisenherg's uncertainty principal rules out the exact simulateous ...

      Text Solution

      |