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Q.

Number of outer shells partially filled for representative elements

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a

One

b

Three

c

Two

d

Zero

answer is B.

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Detailed Solution

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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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