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An atom has 18 neutrons and an atomic number of 17. What is its mass number?

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Question

An atom has 18 neutrons and an atomic number of 17. What is its mass number?

Short Answer
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Solution

The atomic number gives the number of protons, so this atom has 17 protons. Its mass number is the sum of protons and neutrons: 17 + 18 = 35. Therefore, its mass number is 35.

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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 12. | Page 150
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