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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.

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.

Grade:12

2 Answers

SJ
askIITians Faculty 97 Points
3 years ago
The electronic configuration ofCa(20)is=2,8,8,2Number of valance electrons=2
The elements with atomic number12and38both have2valence electrons in their outer shell but elements with19has 1 valance electron and21has3valance electrons. Therefore elements with atomic number12and38have physical and chemical properties resembling calcium.
Harshit Singh
askIITians Faculty 5963 Points
3 years ago
Dear Student

Ca atomic number — 20
Electronic configuration — 2, 8, 8, 2
Elements with atomic number 12 → 2, 8, 2
and atomic number 38 → 2, 8, 18, 8, 2
will resemble calcium as they all have same valence electrons and their chemical properties are also same.

Thanks

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