$\mathrm{N}$ is the symbol of nitrogen.

What do ${\mathrm{N}}_{2,} 2\mathrm{N}, 2{\mathrm{N}}_2$ indicate.

N is the symbol of nitrogen.

How many molecules and atoms are present in $5{\mathrm{N}}_2$?

Some chemical equations are given.

$$\begin{gathered} \mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2 \\ {\mathrm{CH}}_4+2{\mathrm{O}}_2\to {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O} \\ {\mathrm{N}}_2+{\mathrm{O}}_2\to \mathrm{NO} \\ {\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2 \\ {\mathrm{H}}_2+{\mathrm{I}}_2\to \mathrm{HI} \\ \mathrm{Fe}+\mathrm{HCl}\to {\mathrm{FeCl}}_2+{\mathrm{H}}_2 \\ {\mathrm{CO}}_2+\mathrm{C}\to \mathrm{CO} \end{gathered}$$

Which of these are balanced chemical equations?

Some chemical equations are given.

$$\begin{gathered} \mathrm{C}+{\mathrm{O}}_2\to {\mathrm{CO}}_2 \\ {\mathrm{CH}}_4+2{\mathrm{O}}_2\to {\mathrm{CO}}_2+2{\mathrm{H}}_2\mathrm{O} \\ {\mathrm{N}}_2+{\mathrm{O}}_2\to \mathrm{NO} \\ {\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_2 \\ {\mathrm{H}}_2+{\mathrm{I}}_2\to \mathrm{HI} \\ \mathrm{Fe}+\mathrm{HCl}\to {\mathrm{FeCl}}_2+{\mathrm{H}}_2 \\ {\mathrm{CO}}_2+\mathrm{C}\to \mathrm{CO} \end{gathered}$$

Balance those equations which are not balanced.

Haven’t you understood how symbols are assigned to elements? Given below are some elements that received symbols from their Latin names. Complete the table with the help of the Periodic Table.