Why do non metals tend to gain electrons to form negitive ions

Ionic bonds form only between metals and nonmetals. That's because metals “want” to give up electrons, and nonmetals “want” to gain electrons. It takes energy to remove valence electrons from an atom and form a positive ion. Energy is released when an atom gains valence electrons and forms a negative ion

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.