Question

yes or no, are atoms stable if they do not have a full shell? *
atoms \want\ to be stable
how do they get stable?
by filling their valence shells (outermost shells) - octet rule
by being like noble gases - who do not react with other elements because their valence shells are already full
by gaining electron to fill a shell or by losing electrons to get rid of a shell exposing a full one underneath
helium has 2 electrons in the outermost shell.
these atoms have 8 electrons in the outermost shell.
helium, he
neon, ne
argon, ar
krypton, kr
yes
no

Explanation:

Atoms strive for stability by filling their valence shells according to the octet - rule. Noble gases are stable due to full valence shells. Atoms that don't have a full shell are generally reactive and thus not stable.

Answer:

No