Isoeletronic compounds? Watch

User947387
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Particles with the same electron arrangement
are said to be isoelectronic.
Which of the following compounds contains
ions which are isoelectronic?
A CaCl2
B KBr
C MgCl2
D Na2S

My understanding is that compounds/elements are iseletronic if they have the same electron arrangement, so Nitrogen at 2,5; and Oxygen (2,6) with Oxygen+1 e- would be equal because there would be 2,5 for both.

The answer is given as A.. Ca is group 2, so Ca+2 and Cl; at group 7 is Cl-.so, that would make (Cl-)2

Does this mean that chlorine gains 2 electrons and calcium loses 2 electrons? Chlorine only needs one extra electron to become 2,8,8 and Calcium needs to lose 2 electrons to become 2,8,8. But if Chlorine gets its missing electrons from Calcium, surely that would mean that Chlorine would then become 2,8,8,1?
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GDN
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(Original post by apronedsamurai)
Particles with the same electron arrangement
are said to be isoelectronic.
Which of the following compounds contains
ions which are isoelectronic?
A CaCl2
B KBr
C MgCl2
D Na2S

My understanding is that compounds/elements are iseletronic if they have the same electron arrangement, so Nitrogen at 2,5; and Oxygen (2,6) with Oxygen+1 e- would be equal because there would be 2,5 for both.

The answer is given as A.. Ca is group 2, so Ca+2 and Cl; at group 7 is Cl-.so, that would make (Cl-)2

Does this mean that chlorine gains 2 electrons and calcium loses 2 electrons? Chlorine only needs one extra electron to become 2,8,8 and Calcium needs to lose 2 electrons to become 2,8,8. But if Chlorine gets its missing electrons from Calcium, surely that would mean that Chlorine would then become 2,8,8,1?
If you consider the reaction of calcium with chlorine - each calcium atom loses 2 electrons to become 2,8,8 and two chlorine atoms each gain one electron to become 2,8,8
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User947387
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Does this involve balancing ionic equations....?
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User947387
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So, with Particles with the same electron arrangement
are said to be isoelectronic.
Which of the following compounds contains
ions which are isoelectronic?
A CaO
B CaBr2
C Na2O
D LiF

The answer is C; because Na is 2, 8,1 and O is 2,6; but because Na is 2; that means it loses two electrons making it 2,8; and oxygen gains those two electrons, making it 2,8 also?
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