The characteristics which determines an element's reactivity are; Valence electrons and Electronegativity
As we know;
The reactivity of an element is it's ability to undergo a chemical reaction.
Chemical reactions occur as a result of the transfer of electrons between two atoms.
The electrons involved in chemical reactions are the Valence (outermost) electrons.
The electronegativity value of an element is a measure of its electron affinity, i.e how well it readily accepts or losses electrons.
Ultimately, the characteristics which determines an element's reactivity are; Valence electrons and Electronegativity
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