Which of the given elements A,B,C,D and E wit | vedclass

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(B) To determine the period of an element,we look at its electronic configuration.$1$. Element $A$ (Atomic number $2$): Configuration is $2$ (Period $

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$B, C, D$

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(B) To determine the period of an element,we look at its electronic configuration.$1$. Element $A$ (Atomic number $2$): Configuration is $2$ (Period $1$).$2$. Element $B$ (Atomic number $3$): Configuration is $2, 1$ (Period $2$).$3$. Element $C$ (Atomic number $7$): Configuration is $2, 5$ (Period $2$).$4$. Element $D$ (Atomic number $10$): Configuration is $2, 8$ (Period $2$).$5$. Element $E$ (Atomic number $30$): Configuration is $2, 8, 18, 2$ (Period $4$).Elements $B$,$C$,and $D$ all have electrons in $2$ shells,meaning they belong to the $2$nd period.

Period $II$ elements	$B$	$Be$	$O$	$N$	$Li$	$C$
Atomic radius $(pm)$	$88$	$111$	$66$	$74$	$152$	$77$

Which of the given elements $A$,$B$,$C$,$D$ and $E$ with atomic numbers $2$,$3$,$7$,$10$ and $30$ respectively belong to the same period?

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