Question

multiple - choice question
when are most atoms stable?
when they have 10 valence electrons
when they have no electrons
when they have 8 valence electrons
when their first energy level is full

Explanation:

Atoms are most stable when their out - most energy level (valence shell) is full. The first energy level is full with 2 electrons, and for most atoms, the outer shell is full with 8 electrons (octet rule). Having 10 valence electrons is not a general stability criterion for most atoms. Having no electrons means the atom is a bare nucleus and highly reactive. Just having the first energy level full is not enough for most atoms beyond hydrogen and helium.

Answer:

None of the provided options are correct. Most atoms are stable when they have 8 valence electrons (except hydrogen and helium which follow different rules for stability).