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Structure of the Atom — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceStructure of the Atom1 Mark
Question
$_7​N^{15}$ and $_{ 8}​O^{16}$ are a pair of :
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Answer

Two nuclides are isotones if they have the very same neutron number but different proton number.

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