Which of the following is not a way an atom can achieve stability? a. lose electrons to achieve a noble gas configuration b. share electrons to abide by the octet rule c. gain electrons to fill its outer energy level d. remove electrons from its full outer energy level

D. Remove electrons from its full outer energy level

Explanation:
The atom achieves its stable state when its outermost shell is completely full with 8 electrons (based on the octet rule)
Any atom whose outer shell is not completely full tends to lose gain or share electrons in order to complete this shell and become stable
Therefore, it is pointless for an atom with an outer shell having 8 electrons to lose electrons, because by this it convert from being stable to being unstable.

Hope this helps :)

Solubility would be your answer.