Head Elements (Group 1)

The correct o...

Question

The correct order of ionic radii is :

T e^{2 -}

I^{-}

C l^{-}

A r^{+}

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I^{-}

T e^{2 -}

C l^{-}

A r^{+}

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I^{-}

T e^{2 -}

A r^{+}

C l^{-}

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I^{-}

C l^{-}

T e^{2 -}

A r^{+}

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Solution

The correct option is A $T e^{2 -}$ > $I^{-}$ > $C l^{-}$ > $A r^{+}$
Size ∝ number of shells.
Number of shells present in $T e^{2 -}$ & $I^{-}$ (five shells) are more than that in $C l^{-}$ & $A r^{+}$ (three shells).
$T e^{2 -}$ & $I^{-}$ are isoelectronic.
Since, size ∝ negative charge.
So, $T e^{2 -}$ > $I^{-}$ and $C l^{-}$ > $A r^{+}$ .
Combining both factors, overall order is:
$T e^{2 -}$ > $I^{-}$ > $C l^{-}$ > $A r^{+}$

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Similar questions

Q. Order the following elements according to increasing size

C s^{+}, B a^{2 +}, T e^{2 -}, X e I^{-}

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N^{3 -}

N 3 -

H^{+}

H +

.
Smallest

T e 2 < I - < X e < C s + < B a 2 +

Largest.

Q. Which of the following orders are correct with respect to their size?

(1)

A l^{3 +} < M g^{2 +} < N a^{+} < F^{-}

(2)

T e^{2 -} > I^{-} > C s^{+} > B a^{2 +}

(3)

F e^{3 +} < F e^{2 +} < F e^{4 +}

(4)

M g > A l > S i > P

Q. The correct order of polarizability is

I^{-}, B r^{-}, C l^{-}, F^{-}

Q. For the species

(I^{-}, C l^{-}, B r^{-})

, the increasing order of nucleophilicity in water would be:

Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy ) is
(a) F > Cl > Br > I (b) F < Cl < Br < I (c) F < Cl > Br > I (d) F < Cl < Br < I

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