Question

4. The increasing order
order of The ionic radio of the given
electronic species is
a s-2, cl-1,ca+2,k+b) can+2, k+, cl-1, s-2
c) k+, s-2, ca+2, cl-1
d) cl-1, ca+2, k+, s-2
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Answer 1

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K+,Cl−,Ca2+,S2− ions are isoelectronics. The decreasing order of their size is S2−>Cl−>K+>Ca2+.The size of isoelectronics decreases with increase in atomic number. Atomic number of S,Cl,K,Ca are 16,17,19 and 20respectively