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Observe the information and answer t...

Observe the information and answer the following questions
write the elements which belongs to (third ) `3^(rd ) ` period .

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The elements which belongs to `3 ^(rd ) ` period are Sodium `(Na).` Magnesium (Mg) .
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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS -THE PERIODIC TABLE -CREATIVE QUESTIONS FOR NEW MODEL EXAMINATION (SECTION -IV)
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