Complete the Table
Element Subshell electronic configuration No. of the outer most shell Period number
$_{4} B e$ $1 s^{2} 2 s^{2}$ $2$ $2$
$_{6} C$ $1 s^{2} 2 s^{2} 2 p^{2}$ $2$ $2$
$_{11} N a$ $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
$3$ -
$_{19} K$ $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$
-

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Solution

Element Subshell electronic configuration outermost shell number Period number
$_{4} B e$ $1 s^{2} 2 s^{2}$ $2$ $2$
$_{6} C$ $1 s^{2} 2 s^{2} 2 p^{2}$ $2$ $2$
$_{11} N a$ $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
$3$ $3$
$_{19} K$ $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$
$4$ $4$

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Similar questions

Element	Subshell electronic configuration	No. of electrons present in the last subshell	Group number
$L i$	$1 s^{2} 2 s^{2}$	$1$	$1$
$N a$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$	-	$1$
$M g$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2}$	-	$2$
$C a$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 s^{2} 3 p^{6} 4 s^{2}$	-	-

X

Y

X : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

Y : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}

Question 21

The electronic configuration of the outer most shell of the most electronegative elements is

(a) $2 s^{2} 2 p^{5}$

(b) $3 s^{2} 3 p^{5}$

(d) $5 s^{2} 5 p^{5}$

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Element	Subshell electronic configuration	No. of the outer most shell	Period number
$_{4} B e$	$1 s^{2} 2 s^{2}$	$2$	$2$
$_{6} C$	$1 s^{2} 2 s^{2} 2 p^{2}$	$2$	$2$
$_{11} N a$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$	$3$	-
$_{19} K$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$		-

Element	Subshell electronic configuration	outermost shell number	Period number
$_{4} B e$	$1 s^{2} 2 s^{2}$	$2$	$2$
$_{6} C$	$1 s^{2} 2 s^{2} 2 p^{2}$	$2$	$2$
$_{11} N a$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$	$3$	$3$
$_{19} K$	$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}$	$4$	$4$