All elements in 3rd period have

An atomic number 3

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3 complete sub-shells

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Valence electrons shell

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3 electrons less than the octet

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Solution

The correct option is C
Valence electrons shell

As we go down the the periodic table, the number of shells increases by 1.

Period 1 has 1 shell
Period 2 has 2 shells
Period 3 has 3 shells
and so on.

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All the elements in the group have

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