(B) The $Q$ shell corresponds to the principal quantum number $n=7$,which indicates the element is in the $7^{th}$ period of the periodic table.$Ra$ (

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(B) The $Q$ shell corresponds to the principal quantum number $n=7$,which indicates the element is in the $7^{th}$ period of the periodic table.$Ra$ (Radium) has the electronic configuration $[Rn] 7s^2$,meaning it has two electrons in the $7^{th}$ $(Q)$ shell.

Class 11 Chemistry s-Block Elements Alkaline earth metals

Medium

Which of the following elements has two electrons in the $Q$ shell in its ground state?

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A
$Ba$
B
$Ra$
C
$La$
D
$Pb$

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Class 11

Chemistry Questions

Chapter

s-Block Elements

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Alkaline earth metals

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Which among the following elements is used in nuclear reactors as a moderator?

MediumMHT CET 2022

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Match List-$I$ with List-$II$ for the compositions of substances and select the correct answer using the code given below the lists.
List-$I$ Substances List-$II$ Composition
$A$. Plaster of paris $i$. $CaSO_4.2H_2O$
$B$. Epsomite $ii$. $CaSO_4.\frac{1}{2}H_2O$
$C$. Kieserite $iii$. $MgSO_4.7H_2O$
$D$. Gypsum $iv$. $MgSO_4.H_2O$
$v$. $CaSO_4$

List-$I$ Substances	List-$II$ Composition
$A$. Plaster of paris	$i$. $CaSO_4.2H_2O$
$B$. Epsomite	$ii$. $CaSO_4.\frac{1}{2}H_2O$
$C$. Kieserite	$iii$. $MgSO_4.7H_2O$
$D$. Gypsum	$iv$. $MgSO_4.H_2O$
	$v$. $CaSO_4$