आधुनिक आवर्त सारणी के दूसरे तथा तीसरे आवर्त्त में तत्वों की कुल संख्या _______ है। Adhunik Aavart Sarni Ke Dusre Tatha Teesre Aavart Mein Tatvon Ki Kul Sankhya _________ Hai.
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