Question

What is the last element in Period 4?

Answer 1

1. The last element of period 4 is Krypton $\left(\mathrm{Kr}\right)$ has an atomic number is 36. The fourth row of the periodic table is period 4.
2. Krypton comes in the category of noble gas as its electronic configuration is $\left[\mathrm{Ar}\right]3d^{10}4s^{2}4p^6$.
3. It is a highly stable gas.
4. Commercially it is used as filling gas for energy-saving fluorescent lights.
5. Krypton does not affect the human body.