a. Complete the table
Atoms Atomic Number Electronic Distribution
Na 11
Mg 12
Cl 2,8,7
b. Draw the structure of $H_{2} O$ and $N H_{3}$ molecules.

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Solution

$N a$ $11$ ${1 S}^{2} {2 S}^{2} {2 P}^{6} {3 S}^{1} 2, 8, 1$
$M g$ $12$ ${1 S}^{2} {2 S}^{2} {2 P}^{6} {3 S}^{2} 2, 8, 2$
$C l$ $17$ $2, 8, 7$

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