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Chapter 8 Journey Inside the Atom - Part 4

What is the sum of protons and neutrons in an atom called?

Type: MCQ • Marks: 1
What is the sum of protons and neutrons in an atom called?
Options
A. Isotopic number
B. Valency
C. Atomic number
D. Mass number
Explanation
Mass number A = Protons + Neutrons.
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Class 9th Science (MCQ)

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