Write electronic configuration of group I elements of the periodic table.

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Solution

Element Atomic Number Electronic configuration Group Period
$H$ $1$ $1$ $1$ $1$
$L i$ $3$ $2, 1$ $1$ $2$
$N a$ $11$ $2, 8, 1$ $1$ $3$
$K$ $19$ $2, 8, 8, 1$ $1$ $4$
$R b$ $37$ $2, 8, 18, 8, 1$ $1$ $5$
$C s$ $55$ $2, 8, 18, 18, 8, 1$ $1$ $6$
$F r$ $87$ $2, 8, 18, 32, 18, 8, 1$ $1$ $7$

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