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Atomic Radii & Ionization Potential

Which element...

Question

Which element out of He, Ar, Kr and Xe forms least number of compounds?

A

Kr

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B

Xe

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C

Ar

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D

He

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Solution

The correct option is C He
He does not forms chemical compounds due to following reasons.
(1) It has completed duplet. $1 s^{2}$ electronic configuration.
(2) It has very high ionization energy.
(3) It has almost zero or large positive electron affinity.
Hence, it has neither tendency to lose nor to gain an electron and do not enter into chemical combinations.

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Q. Read below given tabular form and answer the questions.

Element	Electronic configuration	Element	Electronic configuration
$H e$	$1 s^{2}$	$K r$	$4 s^{2} 4 p^{6}$
$N e$	$2 s^{2} 2 p^{6}$	$X e$	$5 s^{2} 5 p^{6}$
$A r$	$3 s^{2} 3 p^{6}$	$R n$	$6 s^{2} 6 p^{6}$

Which element has electronic configuration as

n s^{2}

Q. Which of the following is/are true about - He, Ne, Ar, Kr, Xe, Rn etc. ?

Q. Read below given tabular form and answer the questions.

Element	Electronic configuration	Element	Electronic configuration
$H e$	$1 s^{2}$	$K r$	$4 s^{2} 4 p^{6}$
$N e$	$2 s^{2} 2 p^{6}$	$X e$	$5 s^{2} 5 p^{6}$
$A r$	$3 s^{2} 3 p^{6}$	$R n$	$6 s^{2} 6 p^{6}$

Why the above elements are inactive in chemical reactions?

Q. A mixture of He, Ne, Kr and Xe is cooled, Which one of them condenses first ?

Q. The correct order of solubility in water for

H e, N e, A r, K r, X e

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