Why do posisons collect more in carnivores than in herbivores?

The simple answer is bioaccumulation resulting from biomagnification. Carnivores consume organisms at higher trophic levels, and thus "poisons," such as heavy metals accumulate in these organisms at levels greater than those found in plants. Moreover, such chemicals typically accumulate in the fatty tissues of carnivores, such as the nervous, lymphatic, endocrine, and reproductive systems.

answer:

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