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The modrn periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1 st group and the 4 th period? - आधुनिक आवर्त सारणी में 18 समूह और 7 आवर्त होते हैं उस तत्व की परमाणु संख्या क्या है जिसे प्रथम समूह और चौथे आवर्त में रखा गया है?

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The modrn periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1 <sup>st</sup> group and the 4 <sup>th</sup> period? - आधुनिक आवर्त सारणी में 18 समूह और 7 आवर्त होते हैं उस तत्व की परमाणु संख्या क्या है जिसे प्रथम समूह और चौथे आवर्त में रखा गया है?






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