Which of the following best describes an atom that does not have a full valence shell a. the atom may gain, lose, or share electrons to fill its valence shell b. the atom is stable and will not react with other atoms c. the atom will always lose electrons to fill its valence shell d. the atom will always gain electrons to fill its valence shell

Full valence shell is best describe by :

Option A that is the atom may gain , lose or share electrons to fill its valence shell.

Valence shell  have stable electronic confrigration . To achieve the stability they can gain or lose the electron .

Examples: helium , neon and argon  belongs to group 18 they have stable electronic confrigration.

It’s A!

Explanation:

Hope that helps

b. read the phase at the intersection of any given temperature and pressure.