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Elements are arranged in the increasing order of their atomic masses as per Mendeleev's classification. Element X has higher atomic mass than element Y and hence, was placed before it. X has an atomic mass of 58.9 and Y has atomic mass of 58.7. In the periodic table, elements are arranged in the increasing order of their atomic number and hence, the element X, with lower atomic number comes before element Y.1. What is the name of element X?a. Silverb. Cobaltc. Nickeld. Bromium2. What is the name of element Y?a. Silverb. Cobaltc. Nickel3. What is the atomic number of X?a. 26b. 28c. 27d. 294. What is the atomic number of Y?a. 28b. 22c. 29d. 315. The difference in the atomic number of H element will be :a. 1b. 2c. 3d. 4 |
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Answer» 1. b. Cobalt 2. c. Nickel 3. c. 27 4. a. 28 5. a. 1 |
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