Question

How do you name and classify Kr and Xe?

Answer 1

Hint: The given two chemical elements Kr and Xe are the chemical symbol of two noble gases krypton and xenon. The atomic number of Krypton is 36 and the atomic number of Xenon is 54.

Complete answer:
Kr is the chemical symbol used for the chemical element krypton and Xe is the chemical symbol used for the chemical element xenon. Both the chemical element krypton and xenon are group 18 elements which belong to the noble gases family.
The noble gases are also known as inert gases are the class of chemical elements which have similar chemical properties. The elements present in noble gases are odorless, colorless and monoatomic nature. Monatomic means they do not react with other elements as they are stable in nature.
The atomic number of krypton (Kr) is 36. The electronic configuration of krypton is $[Ar]3{d^{10}}4{s^2}4{p^6}$. The valence electrons in krypton is 8. It has stable electronic configuration and does not form any ion. It is a p-block element present in period 4 and group 18.
The atomic number of xenon (Xe) is 54. The electronic configuration of xenon is $[Kr]4{d^{10}}5{s^2}5{p^6}$. The valence electrons in xenon is 8. It has stable electronic configuration and does not form any ion. It is a p-block element present in period 5 and group 18.

Note:
The other chemical elements present in noble gases are helium (He), neon (Ne), Argon (Ar). There is one isotope of krypton represented as ${}^{78}Kr$. There are a total of seven stable isotopes of Xenon ${}^{126}Xe$, ${}^{128 - 132}Xe$, ${}^{134}Xe$.