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JIPMER 2019
Exam
JIPMER
Year
2019
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JIPMER 2019 · Chemistry · Some Basic Concepts of Chemistry

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

An element with mass number 81 contains 31.7%31.7 \% more neutrons as compared to protons. It symbol is

Options

  1. A40x81{ }_{40} x^{81}
  2. B35x81{ }_{35} x^{81}
  3. C81x317{ }_{81} x^{317}
  4. D40x81{ }_{40} x^{81}

Correct answer

B. 35x81{ }_{35} x^{81}

Step-by-step solution

Let, the number of protons =x=\mathrm{x} ∴\therefore Number of neutrons =x+31.7x100=131.7x100=\mathrm{x}+\frac{31.7 \mathrm{x}}{100}=\frac{131.7 \mathrm{x}}{100} mass number = number of protons + number of neutrons 81=x+131.7x10081=x+\frac{131.7 x}{100} ∴x=35\therefore \quad \mathrm{x}=35 Thus, the symbol of the element is 35X81{ }_{35} X^{81}.
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