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Structure of Atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
Question
CI, Cl- have same atomic number or mass number or both? Explain.
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Answer

They have same atomic number as well as mass number. It is because they differ in number of electrons but have same number of protons and neutrons. Atomic number (Z) = Number of protons,
Mass number = Number of protons + Number of neutrons.

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