Non-metals react with hydrogen to form  .

Draw the electronic dot structure of the following-

• ${\mathrm{H}}_2\mathrm{S}$

Why does distilled water not conduct electricity, whereas rain water does? 

Show the formation of $\mathrm{MgO}$ by the transfer of electrons. 

Give reasons.

(ii) Ionic compounds have high melting points.

Draw the electronic dot structure of the following-

• ${\mathrm{NH}}_3$

Draw the electronic dot structure of the following-

• ${\mathrm{F}}_2$

Answer the following:

${\mathrm{MgCl}}_2$ does not conduct electricity in the solid state. Give reasons.

Write the electron-dot structures for the following molecules:

(a) $\mathrm{NaCl}$

(b) ${\mathrm{Cl}}_2$