Ions occur when the number of changes protons

Ions form from elements when they gain or lose an electron causing the number of protons to be unequal to the number of electrons, resulting in a net charge. If there are more electrons than protons (from an element gaining one or more electrons), the ion is negatively charged and called an anion

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answer:

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