In the modern periodic table calcium atomic number 20 is surrounded by elements with atomic number 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium ?
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The element having atomic number 12 and 38 resemble physical and chemical properties with calcium (20). This is because the valence electron of in these element is same as calcium (. e. =2) and the physical and chemical properties depend on the number of valence electron present in the outermost shell.
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