Which element would you expect to have a full valence shell?

Answer;

-Noble gases or Group 18 elements

Explanation;

A full valence shell is the most stable electron configuration. Group 18 elements or noble gases such as helium, neon, and argon, have a full outer, or valence, shell. Elements in other groups have partially-filled valence shells and gain or lose electrons to achieve a stable electron configuration.

They are extremely unreactive and do not form bonds with themselves. Solid helium is the the ultimate fine powder being monotomic.

We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars. We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i.e. when the lava cooled and crystallized). We also have meteorites from asteroids and can date them, too.

Explanation:

Have a great day <3