GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius
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Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
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Atomic radius of the elements increases as one moves down the first group of the periodic table
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Atomic radius of the elements decreases as one moves across from left to right in the 2nd period
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Detailed explanation-1: -It is observed that ionic radius is decreased with increasing positive charge and increased with increasing negative charge, and thus, anions are almost always larger than cations. From this, we can say that option A is the wrong statement and option B is the correct statement.
Detailed explanation-2: -Solution : Amongst isoelectronic species, smaller the positive charge, smaller is the ionic radius is the wrong statement. Actually it should be smaller the positive charge, bigger is the ionic radius.
Detailed explanation-3: -Isoelectronic species have the same number of electrons.
Detailed explanation-4: -Solution: Ionic radii for isoelectronic species decrease as nuclear charge rises (i.e., no. of protons). The cation with the greater +ve charge will therefore have a smaller radius and the anion with the greater-ve charge will have a bigger radius for isoelectronic species.
Detailed explanation-5: -In case of isoelectronic ions the ionic size increases with the increase in atomic number.