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Periodic Classifications of Elements
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?
The elements which have the same valance electrons will have similar physical and chemical properties. The electronic configuration of calcium is (2, 8, 8, 2). It means that it has 2 valance electrons.
Electronic configuration of given elements
Atomic number 12: (2, 8, 2)
Atomic number 19: (2, 8, 8, 1)
Atomic number 21: (2, 8, 8,3)
Atomic number 38: (2, 8, 18, 8, 2)
From the given elements, the element with atomic number 12 and 38 have 2 valance electrons. So, they will have the same chemical and physical properties as calcium.
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