Answer:
A. Neon and argon
General Formulas and Concepts:
- Reading the Periodic Table of Elements
- Valence Shell configurations
Explanation:
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
A. would be the correct answer.
