Question

3th group and 2th period
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Answer 1

Answer:

Answer : (a) The element placed in 2nd Group and 3rd Period of the Periodic Table is Magnesium (Mg). ... Magnesium loses two electrons and oxygen gains two electrons to complete the octet structure.

Explanation:

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Answer 2

Explanation:

in period 3 valence shell is 3 that is n=3 and since it's present in group 2, it has 2 valence electrons in the third shell. ... Hence in the first orbital, it will have 2 whereas in second orbital it will have 8 electrons, on the whole, it has 12 electrons that is the atomic number is 12.