Name a non-metal which is used in the vulcanization of rubber.

Match the following: 

Match the following:

Atomic numbers of five elements ${\mathrm{E}}_1$, ${\mathrm{E}}_2$, ${\mathrm{E}}_3$, ${\mathrm{E}}_4$ and ${\mathrm{E}}_5$ are $10, 12, 13, 16$ and $17$.

Which element is chemically inert?

Atomic numbers of five elements are ${\mathrm{E}}_1$, ${\mathrm{E}}_2$, ${\mathrm{E}}_3$, ${\mathrm{E}}_4$ and ${\mathrm{E}}_5$ are $10, 12, 13, 16$ and $17$.

Which element belongs to halogens?

Atomic numbers of five elements are $$${\mathrm{E}}_1$, ${\mathrm{E}}_2$, ${\mathrm{E}}_3$, ${\mathrm{E}}_4$ and ${\mathrm{E}}_5$ are $10, 12, 13, 16$ and $17$.

Which element exists as metals and non-metals?