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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements2 Marks
Question
In the modem periodic table, the element Calcium (atomic number = 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these elements has physical and chemical properties resembling those of Calcium and why?
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Answer

The electronic configuration of calcium (20) = 2, 8, 8, 2.
The electronic configuration of other 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
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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