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The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period |
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Answer» The atomic number of an element is 20. In the modern periodic table, this element is placed in : (a) 2nd period (b) 4th period (c) 3rd period (d) 1st period |
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