The elements with atomic number $117$ and $120$ are yet to be discovered. In which group would you place these elements when discovered?

Atomic numbers of three elements $E_1$,$E_2$ and $E_3$ of the periodic table are $Z_1$,$50$ and $Z_2$ respectively. From the position of the elements shown in the figure,the value of $(Z_2 - Z_1)$ is:

The element with atomic number $12$ belongs to ......... group and ......... period.

Justify the given statement with suitable examples: "the properties of the elements are a periodic function of their atomic numbers".

Which of the following is the incorrect match for the atom of an element?

Choose the correct $IUPAC$ symbol and $IUPAC$ official name for the element with atomic number $108$.