The metal present in the egg shell belongs to:

2^{n d} p e r i o d

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3^{r d} p e r i o d

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4^{t h} p e r i o d

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5^{t h} p e r i o d

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Solution

The correct option is C $4^{t h} p e r i o d$
The metal present in egg shell is calcium with atomic number 20. So it belongs to group II of alkaline earth metals and period IV of the periodic table.

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