Part A O2 is larger than O . is larger than . SubmitMy AnswersGive Up Part B S2

Question

Part A

O2 is larger than O .

is larger than .

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Part B

S2 is larger than O2 .

is larger than .

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Part C

S2 is larger than K+ .

is larger than .

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Part D

K+ is larger than Ca2+ .

is larger than .

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O2 is larger than O because the increase in electron repulsions that accompany addition of an electron causes the electron cloud to expand. O2 is larger than O because O is neutral but O2 has a charge 2. O2 is larger than O because the decrease in electron repulsions that accompany addition of an electron causes the electron cloud to expand. O2 is larger than O because O2 has has the larger Z than O.

Explanation / Answer

Part A

O2 is larger than O

The number of electrons in O is 8 & in O2- is 10

But the number of protons are the same i.e., 8

So the effective nuclear charge will be more in O so its radius will be less than that of O2- so the O2 is larger than O because the increase in electron repulsions that accompany addition of an electron causes the electron cloud to expand.

Part B

S2 is larger than O2

S2 is larger than O2 because for particles with like charges, size increases going down a family.

Part C

S2 is larger than K+ .

The number of electrons in S2 & K+ are 18

But the number of protons in S2 is 16 & that in K+ is 19

So the effective nuclear charge will be more in K+ so its radius will be less than that of S2-

S2 is larger than K+ because the two ions are isoelectronic and K+ has the larger Z and Zeff.

Part D

K+ is larger than Ca2+ .

The number of electrons in Ca2+ & K+ are 18

But the number of protons in Ca2+ is 20 & that in K+ is 19

So the effective nuclear charge will be more in Ca+ so its radius will be less than that of K+

|rmK+ is larger than Ca2+ because the two ions are isoelectronic and Ca2+ has the larger Z and Zeff.

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