Discuss the position of He and H in the perio | vedclass

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(C) The position of an element in the periodic table is determined by its electronic configuration. $H$ (Hydrogen) has an atomic number of $1$ and an

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Hydrogen is placed in group $1$ due to its electronic configuration $1s^1$,while Helium is placed in group $18$ due to its stable noble gas configuration $1s^2$.

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(C) The position of an element in the periodic table is determined by its electronic configuration. $H$ (Hydrogen) has an atomic number of $1$ and an electronic configuration of $1s^1$. Due to its ability to lose one electron like alkali metals or gain one electron like halogens,it is often placed at the top of group $1$. $He$ (Helium) has an atomic number of $2$ and an electronic configuration of $1s^2$. Since its valence shell is completely filled (duplet),it exhibits properties of noble gases and is placed in group $18$.

List-$I$ (Atomic number)	List-$II$ (Group number and Period number)
$A$. $56$	$I$. $9, 4$
$B$. $50$	$II$. $3, 6$
$C$. $27$	$III$. $14, 5$
$D$. $58$	$IV$. $2, 6$

Discuss the position of $He$ and $H$ in the periodic table.

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Match the following:

List-$I$ (Atomic number) List-$II$ (Group number and Period number)

$A$. $56$ $I$. $9, 4$

$B$. $50$ $II$. $3, 6$

$C$. $27$ $III$. $14, 5$

$D$. $58$ $IV$. $2, 6$

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