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An atom 23⁢A has 11 electrons. Find the number of neutrons in it.

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Question

An atom \begin{array}{l} {}^{23}\mathrm{A} \end{array} has 11 electrons. Find the number of neutrons in it.

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Solution

The atom has 11 electrons, so a neutral atom has 11 protons. Its mass number is 23. Therefore, the number of neutrons is 23 − 11 = 12.

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Chapter 8: Journey Inside the Atom - Intext Questions [Page 150]

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NCERT Science Exploration [English] Class 9
Chapter 8 Journey Inside the Atom
Intext Questions | Q 13. | Page 150
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