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PART - 1 CH - 1 Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 1 Some Basic Concepts of Chemistry1 Mark
Question
${ }_{18} Ar ^{20}$ and ${ }_{20} Ca ^{40}$ are__________.
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Answer

isobars

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