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

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(D) To determine the period of an element,we look at its electronic configuration.$A$ (Atomic number $2$): Configuration is $2$ ($K$-shell). It belong

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$B, C, D$

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(D) To determine the period of an element,we look at its electronic configuration.$A$ (Atomic number $2$): Configuration is $2$ ($K$-shell). It belongs to Period $1$.$B$ (Atomic number $3$): Configuration is $2, 1$. It belongs to Period $2$.$C$ (Atomic number $7$): Configuration is $2, 5$. It belongs to Period $2$.$D$ (Atomic number $10$): Configuration is $2, 8$. It belongs to Period $2$.$E$ (Atomic number $30$): Configuration is $2, 8, 18, 2$. It belongs to Period $4$.Elements with the same number of shells belong to the same period.Elements $B, C,$ and $D$ all have $2$ shells,so they belong to Period $2$.

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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