Question

An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide (c) Write the balanced equation when it burns in the presence of air.

Answer 1

Element in 2nd group and 3rd period:

• The element present in the second group and the third period is Magnesium.
• The symbol for magnesium is $\mathrm{Mg}$.

Balanced equation;

• When magnesium is burnt in the air, the formation of Magnesium oxide takes place.
• The reaction of $\mathrm{Mg}$ in presence of air is as follows:-

$$\begin{gathered} 2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2\mathrm{MgO}\left(\mathrm{s}\right) \\ \mathrm{Magnesium}\mathrm{Oxygen}\mathrm{Magnesium}\mathrm{oxide} \end{gathered}$$