Can I have some help please? There are three images each needing an explanation. If one of you all would be kind enough to teach me how to figure them out; please do!

answer:

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

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.