Chemistry Definition in your own words. I will check if you got it from online.

Word:
Oxidizer

oxidizer: one used to support the combustion of a rocket propellant

word: a single distinct meaningful element of speech or writing

Explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

answer:

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