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Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40? यदि कैल्सियम का परमाणु-क्रमांक 20 है और इसकी द्रव्यमान-संख्या 40 है‚ तो निम्नलिखित में से कौन-सा तत्व‚ कैल्सियम का समभारिक परमाणु होगा?

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Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40? यदि कैल्सियम का परमाणु-क्रमांक 20 है और इसकी द्रव्यमान-संख्या 40 है‚ तो निम्नलिखित में से कौन-सा तत्व‚ कैल्सियम का समभारिक परमाणु होगा?






 
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