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Question

The molecule in which cations are isoelectric with anions is:

A
sodium chloride
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B
potassium bromide
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C
lithium fluoride
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D
rubidium bromide
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Solution

The correct option is D rubidium bromide
When cations and anions have a same number of electrons, they are called isoelectronic.
Rubidium bromide is RbBr.
Atomic No. of Rb
Electrons in Br is 36. they are isoelectronic.

Sodium chloride is NaCl.
Electrons in Na+ is 10.
Electrons in Cl is 18.


Potassium bromide is KBr.
Electrons in K+ is 18.
Electrons in Br is 36.

Lithium fluoride is LiF.
Electrons in Li+ is 2.
Electrons in F is 10.


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