In theModern Periodic Table, calcium (atomic number 20) is surrounded byelements with atomic numbers 12, 19, 21, and 38. Which of these havephysical and chemical properties resembling calcium?

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Solution

Theelement with atomic number 12 has same chemical properties as that ofcalcium. This is because both of them have same number of valenceelectrons (2).

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12, 19, 21, 38

Chlorine in the Periodic Table is surrounded by the elements with atomic number 9, 16, 18 and 35.

(a) Which of these have Physical and Chemical properties resembling chlorine ?

(b) Which is more electronegative than chlorine ?

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