In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?

$(A) R b and C s$

$(B) N a and K$

$(C) A r and K r$

$(D) I and A t$

Choose the correct answer from the options given below:

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Solution

Element Electron gain enthalpy $(k J m o l^{- 1})$

$R b$ $- 47$

$C s$ $- 46$

Electron gain enthalpy of $A r a n d K r$ is also same +96 kJ/mol .

Hence the correct option is $(C)$ .

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Similar questions

Which of the following pairs of elements would have a more negative electron gain enthalpy?
(i) O or F

(ii) F or Cl

Which of the following pairs of elements would have a more negative electron gain enthalpy?

(i) O or F (ii) F or Cl

Electronic configuration of some elements is given in Column I and their electron gain enthalpies are given in Column II. Match the electronic configuration with electron gain enthalpy.

	Electronic configuration		Electron gain enthalphy/KJ ${mol}^{- 1}$
A	$1 s^{2} 2 s^{2} 2 p^{6}$	(i)	-53
B	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$	(ii)	-328
C	$1 s^{2} 2 s^{2} 2 p^{5}$	(iii)	-141
D	$1 s^{2} 2 s^{2} 2 p^{4}$	(iv)	+48

Q. Which of the following pairs of elements would have a more negative electron gain enthalpy? Explain
(a)

N

O

(b)

F

C l

Q. Define electron gain enthalpy. Explain, why electron gain enthalpies of some elements are positive? How does electron gain enthalpy vary in the group and in a period?

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Element	Electron gain enthalpy $(k J m o l^{- 1})$
$R b$	$- 47$
$C s$	$- 46$

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below:

Element Electron gain enthalpy (kJ mol–1) Rb –47 Cs –46 Electron gain enthalpy of Ar and Kr is also same +96 kJ/mol . Hence the correct option is (C).

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?

$(A) R b and C s$

$(B) N a and K$

$(C) A r and K r$

$(D) I and A t$

Choose the correct answer from the options given below:

Element Electron gain enthalpy $(k J m o l^{- 1})$

$R b$ $- 47$

$C s$ $- 46$

Electron gain enthalpy of $A r a n d K r$ is also same +96 kJ/mol .

Hence the correct option is $(C)$ .