SELECT * FROM question_mgmt as q WHERE id=3625 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=256 and ex_no='4' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Periodic Classification of Element in the modern periodic table calcium atomic numb

Question:

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?

Answer:

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

Calcium electronic is - 2,8,2

Element having atomic number 12 have - 2,8,2.


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