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The number of neutrons in an atom of $^{131}_{53}I$ is A - VCE - SSCE Chemistry - Question 1 - 2004 - Paper 1

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The number of neutrons in an atom of $^{131}_{53}I$ is A. 53 B. 78 C. 131 D. 184

Worked Solution & Example Answer:The number of neutrons in an atom of $^{131}_{53}I$ is A - VCE - SSCE Chemistry - Question 1 - 2004 - Paper 1

Step 1

Calculate the number of neutrons

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Answer

To find the number of neutrons in an atom, we can use the formula:

extNumberofNeutrons=extMassNumber−extAtomicNumber ext{Number of Neutrons} = ext{Mass Number} - ext{Atomic Number}

In this case, the mass number of iodine (131I^{131}I) is 131, and the atomic number (the number of protons) is 53.

Now, substituting the values:

extNumberofNeutrons=131−53=78 ext{Number of Neutrons} = 131 - 53 = 78

Step 2

Select the correct answer

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Answer

Based on the calculation, the number of neutrons in an atom of 131I^{131}I is 78. Therefore, the correct answer is B.

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