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Ionisation Energy

In which of t...

Question

In which of the following cases, the former change would require lesser energy than the latter?

B e^{+} (g) \to B e^{2 +} (g) + e^{-}; B e (g) \to B e^{+} (g) + e^{-}

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N a (g) \to N a^{+} (g) + e^{-}; C l^{-} (g) \to C l (g) + e^{-}

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A g (g) \to A g^{+} (g) + e^{-}; A u (g) \to A u^{+} (g) + e^{-}

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O^{-} (g) \to O (g) + e^{-}; S^{-} (g) \to S (g) + e^{-}

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Solution

The correct options are
C $A g (g) \to A g^{+} (g) + e^{-}; A u (g) \to A u^{+} (g) + e^{-}$
D $O^{-} (g) \to O (g) + e^{-}; S^{-} (g) \to S (g) + e^{-}$
(A) For all elements, $I E_{1} < I E_{2} < I E_{3}$
(B) The minimum value of IE for an element in periodic table $(N a)$ is also greater than the maximum value of $Δ H_{e g}$ for an element in periodic table $(C l)$ (w.r.t. magnitude only).
(C) Due to poor shielding effect of 4f electrons, $I E$ for $A u > I E$ for $A g$ .
(D) $Δ H_{e g}$ for $S > Δ H_{e g}$ for oxygen because of small size of oxygen (w.r.t. magnitude only).

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Similar questions

O_{(g)} + e^{-} \to O_{(g)}^{-}, Δ H_{1}

F_{(g)} + e^{-} \to F_{(g)}^{-}, Δ H_{2}

C l_{(g)} + e^{-} \to C l_{(g)}^{-}, Δ H_{3}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{2 -}, Δ H_{4}

O_{(g)} + e^{-} \to O_{(g)}^{-} Δ H_{1}

O_{(g)}^{-} + e^{-} \to O_{(g)}^{- 2} Δ H_{2}

O_{2 (g)} \to O_{2 (g)}^{+} + e^{-} Δ H_{3}

O_{(g)} \to O_{(g)}^{+} + e^{-} Δ H_{4}

H_{2 (g)} \to H_{2 (g)}^{+} + e^{-} Δ H_{5}

H_{(g)} \to H_{(g)}^{+} + e^{-} Δ H_{6}

O_{(g)} + 2 e^{-} \to O^{- 2} Δ H_{7}

N a F (s)

N a_{(g)} \to N a_{(g)}^{+} + e^{-}

F_{(g)} + e^{-} \to F_{(g)}^{-}

N a_{(g)}^{+} + F_{(g)}^{-} \to N a F_{(s)}

M (s) \to M (g) . . . . . (a)

M (s) \to M^{2 +} (g) + 2 e^{-} . . . . . (b)

M (g) \to M^{+} (g) + e^{-} . . . . . (c)

M^{+} (g) \to M^{2 +} (g) + e^{-} . . . . . (d)

M (g) \to M^{2 +} (g) + 2 e^{-} . . . . . (e)

M (s)

M^{+} (g)

S (g) + e^{-} \to S^{-} (g), Δ H = - 207.6 k J

S (g) + 2 e^{-} \to S^{2 -} (g), Δ H = + 335.2 k J

S^{-} (g) + e^{-} \to S^{2 -} (g)

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