# Which of the following isoelectronic species has the largest radius?

1. A

${\mathrm{K}}^{+}$

2. B

${\mathrm{Ca}}^{2+}$

3. C

${\mathrm{P}}^{3-}$

4. D

${\mathrm{S}}^{2-}$

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### 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

Therefore, isoelectronic species has the largest radius is

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