Question

What is the formula of aluminium?

Answer 1

1. Aluminium is denoted by $\mathrm{Al}$ having atomic number $13$ and atomic mass $27$ with electronic configuration ${}_{}{}^{13}\mathrm{Al}=\left[\mathrm{Ne}\right]3{\mathrm{s}}^{2}3{\mathrm{p}}^1$.
2. It is silvery grey metal belongs to $3^{rd}$period and from p-Block.
3. Aluminium has to melt and boiling point $933.47K$and $2743K$, have density $2.70{\mathrm{gcm}}^{-3}$.
4. Aluminium is an element, so it doesn't have a formula, it has a symbol which is $\mathrm{Al}$.
5. Aluminium has a good affinity with oxygen and forms a layer which is protective in nature i.e.,${\mathrm{Al}}_2{\mathrm{O}}_3$.

Reaction Involved-

$\mathrm{Al}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{Al}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)$

5. It is soft in nature, non-magnetic and ductile.

6. The most stable isotope of aluminium of ${}_{}{}^{27}\mathrm{Al}$ this makes aluminium ${20}^{th}$most common element in the universe.

7. ${}_{}{}^{26}\mathrm{Al}$ is a radioactive isotope of aluminium used in radio dating.