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Q.

Which of the following isoelectronic species has the largest radius?

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a

Ca2+

b

P3

c

S2

d

K+

answer is C.

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Detailed Solution

Atomic radius decreases as we move from left to right in a period and it increases when we go down a group.

They all are isoelectronic they all contain the same no. of electrons 

for isoelectronic ion ionic radii α1No. of protons 

Therefore, isoelectronic species has the largest radius is 

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Which of the following isoelectronic species has the largest radius?