In the Modern Periodic Table, the element Calcium (atomic number $= 20$ ) is surrounded by elements with atomic number $12, 19, 21$ and $38$ . Which of these element has physical and chemical properties resembling those of Calcium and why?

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Solution

The elements having a number $12$ and $38$ resemble physical and chemical properties with calcium $(20)$ . This is because the valence electrons at these elements are same as calcium (2 electrons in valence shell) and the physical and chemical properties depend on the number of valence electron present in the outermost shell.

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In the Modern Periodic Table, the element Calcium (atomic number =20) is surrounded by elements with atomic number 12, 19, 21 and 38. Which of these element has physical and chemical properties resembling those of Calcium and why?

In the Modern Periodic Table, the element Calcium (atomic number $= 20$ ) is surrounded by elements with atomic number $12, 19, 21$ and $38$ . Which of these element has physical and chemical properties resembling those of Calcium and why?