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Number of outer shells partially filled for representative elements

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answer is B.

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Detailed Solution

The elements in which outermost orbit is partially filled with valence electrons in s and p subshells are representative elements.

IA,IIA,IIIA to VIIA group elements are representative elements.

IA --- ns¹

IIA --- ns²

IIIA --- ns²np¹

IVA --- ns²np²

VA --- ns²np³

VIA --- ns²np⁴

VIIA --- ns²np⁵

Hence, only one outer shell is partially filled for representative elements.

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