Question

What is the last element in Period 3?

Answer 1

1. The last element of period 3 is Argon$\left(\mathrm{Ar}\right)$. Period 3 is the third row of the periodic table.
2. Argon has the atomic number 18. Its outermost shell has complete eight electrons.
3. So that It is highly stable and those elements that have a complete octet come under the category of Noble gas or Inert gas.
4. It is an odourless, tasteless and colourless gas.
5. Argon is used in creating an inert atmosphere. In this way, it helps in the production of Titanium $\left(\mathrm{Ti}\right)$ and other reactive metals.
6. If inhaled by humans it sets deep in the lungs and causes displacement of of oxygen leads to Inert gas Asphyxiation.