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In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers

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In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?

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The element with atomic number 12 has same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2).

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