Draw the electron dot structure of Sodium chloride. $[\mathrm{Na} = 11, \mathrm{Cl} = 17]$

Write a balanced chemical equation the following reaction:

Reduction of copper (II) oxide by hydrogen

Give one word or a phrase for the following statement:

• The chemical bond formed by a shared pair of electrons each bonding atom contributing one electron to the pair.

The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.

Name the element which forms an ionic compound with chlorine.

Draw the electron dot diagram for the compound given below. Represent the electrons by (.) and (x) in the diagram.

• Calcium oxide [Atomic No. of $\mathrm{Ca}=20$ and $\mathrm{O}=8$]

Draw the electron dot diagram for the compound given below. Represent the electrons by (.) and (x) in the diagram.

• Chlorine molecule [Atomic No.$\mathrm{Cl}=17$]