The number of outermost subshell electrons determines chemical reactivity and stability in atoms.
The number of electrons in the outermost subshell of the reacting elements determines chemical reactivity as these electrons are farthest from the nucleus and interact most with other atoms, influencing the atom's ability to accept or give up electrons easily.
Valence electrons play a significant role in chemical reactions, with atoms tending to gain or lose electrons to achieve a full outer shell and stability.
Full valence shell results in atom stability, while an incomplete valence shell leads to reactivity and a tendency to form bonds to achieve stability.
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