Question

How to write the name of ${\text{HA}}{{\text{u}}^{{\text{3 + }}}}$ using stock notation. For example ${\text{HAuC}}{{\text{l}}_{\text{4}}}$ is written as ……..(III) chloride. Fill the blank space?

Answer 1

In chemistry, the periodic table plays a vital role. In the periodic table there are totally $118$ elements. In the periodic table there are totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, totally $7$ period in the table. In the periodic table seventeenth group is the halogen group. In this group, four elements are only considered as halogen out of five elements in the column. There are fluorine, chlorine, bromine and iodine considered as halogen in the modern periodic table.

Complete Answer:
The given data is ${\text{HAuC}}{{\text{l}}_{\text{4}}}$.
The stock notation is nothing but the representation used to oxidize the state of the elements.
${\text{HAuC}}{{\text{l}}_{\text{4}}}$ is one of the acid compounds.
Hence, possible is ${{\text{H}}^{\text{ + }}}{\text{ + AuC}}{{\text{l}}_{\text{4}}}^ -$.
Hence, ${\text{HA}}{{\text{u}}^{{\text{3 + }}}}$ is not possible in chemistry.
${\text{HAuC}}{{\text{l}}_{\text{4}}}$is written as gold (III) chloride.

Note:
We must have to remember that gold is one of the transition elements in the periodic table. The atomic number of gold is $79$ and the mass number of gold is $196.967$. The symbol of gold is ${\text{Au}}$. The atomic number of the atom depends on the number of protons or the number of electrons. The atomic number of the atom is equal to the number of protons or the number of the electrons. The mass number of the atom depends on the number of protons and the number of neutrons. The mass number of the atom is equal to the sum of the number of protons and the number of neutrons in the atom. Each element in the periodic table has a certain group and period.