आधुनिक आवर्त सारणी में तत् – McqOptions

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1.	आधुनिक आवर्त सारणी में तत्वो के वर्गीकरण का आधार है -
A.	परमाणु संख्या
B.	परमाणु द्रव्यमान
C.	परमाणु आयतन
D.	परमाणु घनत्व
Answer» B. परमाणु द्रव्यमान

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