Question

Ag+ ion is isoelectronic with 1.Cu+ 2. Au3+ 3. Zn2+ 4. Cd2+

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Answer 1

Answer

Cr2+

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Answer 2

$Ag^+$ is isoelectronic with $Cd^{+2}$.

• The species which contain the same number of electrons are called isoelectronic species.
• The number of electrons in $Ag^+$ is 47-1=46.
• The number of electrons in $Au^{+3}$ is 79-3=76.
• The number of electrons in $Zn^{+2}$ is 30-2=28.
• The number of electrons in $Cd^{+2}$ is 48-2=46.
• Hence $Cd^{+2}$ is isoelectronic with $Ag^{+}$ as they contain the same number of electrons.
• Hence the correct option is 4.