The two elements have similar properties and 8 electrons in their outermost shells Krypton and xenon. Thus, option "D" is correct.
Which elements t have a full valence shell?
Elements that have a full valence shell (the outermost shell), are in Group 18 of the Periodic Table.
Because their outermost shell is full, they are inert, meaning that they do not like to bond or react with other elements.
Therefore, these gases with a stable full valence shell are known as Noble Gases.
- Helium
- Neon
- Argon
- Krypton
- Xenon
- Radon
Thus, option "D" is correct.
To learn more about Noble Gases click here:
https://brainly.com/question/11764545
#SPJ1
