76. The absolute value of charge on electron was determined by

1. 1. J.J. Thomson

   
   
   

   2. R.A. Millikan

   
   
   

   3. Rutherford

   
   
   

   4. Chadwick

   
   
   

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   NA

   Correct Option: B

   NA

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77. The fundamental particles present in equal numbers in neutral atoms are

1. 1. protons and electrons

   
   
   

   2. neutrons and electrons

   
   
   

   3. protons and neutrons

   
   
   

   4. protons and positrons

   
   
   

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   NA

   Correct Option: A

   NA

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78. Al³⁺ is iso electronic with

1. 1. F^-

   
   
   

   2. S^2-

   
   
   

   3. Al

   
   
   

   4. Br^-

   
   
   

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   NA

   Correct Option: A

   NA

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79. Species containing same number of electrons are called

1. 1. Isotopes

   
   
   

   2. Isobars

   
   
   

   3. Isoelectronic

   
   
   

   4. Isotones

   
   
   

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   NA

   Correct Option: C

   NA

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80. Which of the following atom contains the least number of neutrons

1. 1. ²³⁵U₉₂

   
   
   

   2. ²³⁸U₉₂

   
   
   

   3. ²³⁹U₉₃

   
   
   

   4. ²⁴⁰Np₉₃

   
   
   

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   NA

   Correct Option: A

   NA

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