Journey Inside the Atom
CBSE · Class 9 · Science
All formulas from Journey Inside the Atom in CBSE Class 9 Science. Key equations, constants, and identities for board exam preparation.
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4. Mass of Atom and Neutron
Mass number = Number of protons + Number of neutrons
Atom count in paper thickness estimate: number of atoms ≈ (10^-4 m) ÷ (10^-10 m) = 10^6
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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