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a
Elements of second period
b
Elements of third period
c
both 1 and 2
d
Elements of first period
answer is C.
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Detailed Solution
Elements of second and third period show diagonal relation ship.The pairs that exhibit diagonal relation ship in the periodic table areLi - Mg ;Be - Al ;C - Si .Diagonal relation ship is limited up to IVA group, after IVA group it disappears.