Home
Class 11
CHEMISTRY
symbols .(35)^(79) Br and ^(79)Br can b...

symbols `._(35)^(79) Br and ^(79)Br` can be writtem whereas symbols ` ._(79)^(35) Br and ^(35)Br` ar not acceptable. Answer briefly.

Text Solution

Verified by Experts

Atomic number of an element (say Br) is fixed but its mass number is not fixed depending upon the isotope. Hence, it is necessary to indicate mass number.
Promotional Banner

Topper's Solved these Questions

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise NCERT (Exemplar Problems) (Multiple Choice Questions (Type-I)|16 Videos

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise NCERT (Exemplar Problems) (Multiple Choice Questions (Type-II)|5 Videos

  • STRUCTURE OF ATOM

    MODERN PUBLICATION|Exercise Advanced Level (Problems)|12 Videos

  • STATES OF MATTER : GASES AND LIQUIDS

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos

  • THERMODYNAMICS

    MODERN PUBLICATION|Exercise Unit Practice Test|12 Videos

Similar Questions

Explore conceptually related problems

Symbols ._(35)^(79) Br and ^(79)Br can be written whereas symbols _(79)^(35) Br and ^(35)Br are not acceptable. Answer briefly.

Symbols ._(35)^(79)Br and .^(79)Br can be written whereas symbols ._(79)^(35) Br and ._(35)Br are not accepted. Answer in brief.

CH_3Br can be prepared by

C_(4)H_(9)Br can represent

Bromine occurs in nature mainly in the form of two isotopes ._(35)^(79)Br and ._(35)(81)Br . If the abundance of ._(35)^(79)Br isotope is 49.7 ^% and that of ._(35)^(81)Br isotope is 50.3 %, calculate the average atomic mass of bromine.

Which of the following symbols are not acceptable ? (i) ._(35)^(79)Br (ii) .^(79)Br (iii) ._(79)^(35)Br (iv) ._(35)Br

MODERN PUBLICATION-STRUCTURE OF ATOM-NCERT FILE SOLVED (TEXT BOOK EXERCISES)
  1. In Milikan's experiment, static electrons charge on the oil drops has ...

    Text Solution

    |

  2. In Rutherford's experiment, generally the thin foil of heavy atoms, su...

    Text Solution

    |

  3. symbols .(35)^(79) Br and ^(79)Br can be writtem whereas symbols .(7...

    Text Solution

    |

  4. An element with mass number 81 contains 31.7% more neutrons as compare...

    Text Solution

    |

  5. Species X with mass number 37 contains 11.1 % more neutrons as compa...

    Text Solution

    |

  6. An ion with mass number 56 contains 3 units of positive charge and 30....

    Text Solution

    |

  7. Arrange the following type of radiations in increasing order of freque...

    Text Solution

    |

  8. Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If th...

    Text Solution

    |

  9. Neon gas is generally used in the sign boards. If it emits strongly at...

    Text Solution

    |

  10. In astronomical observations, signals observed from the distant stars ...

    Text Solution

    |

  11. Lifetimes of the molecules in the excited states are often measured by...

    Text Solution

    |

  12. The longest wavelength doublet absorption is observed at 589 and 589.6...

    Text Solution

    |

  13. The work function for caesium atom is 1.9 eV. Calculate (a) the thresh...

    Text Solution

    |

  14. Following results are observed when sodium metal is irradiated with di...

    Text Solution

    |

  15. The ejection of the photoelectron from the silver metal in the photoel...

    Text Solution

    |

  16. If the photon of the wavelength 150 p m strikes an atom and one of its...

    Text Solution

    |

  17. Emission transitions in the Paschen series end at orbit n = 3 and star...

    Text Solution

    |

  18. Calculate the wavelength for the emission transition if it starts from...

    Text Solution

    |

  19. Dual behaviour of matter proposed by de Broglie led to the discovery o...

    Text Solution

    |

  20. Similar to electron diffraction, neutron diffraction microscope is als...

    Text Solution

    |