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AP EAMCET201921 Apr 2019Evening ShiftChemistryStructure of AtomActual

An element with mass number 181 contains 32 % more neutrons as compared to protons. What is the symbol of that element?

Options

  1. APt
  2. BPd
  3. CAu
  4. DHg

Correct answer

A. Pt

Step-by-step solution

Let a be the number of protons in an element. The number of neutrons is a + 0 . 32 a = 1 . 32 a   As the mass number is 181 . It is equal to the sum of the number of protons and the number of neutrons. 181 = a   +   1 . 32 a a = 78 Which is equal to atomic number of Pt .

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