What is the cycle of chemistry?

Chemical cycling describes systems of repeated circulation of chemicals between other compounds, states and materials, and back to their original state, that occurs in space, and on many objects in space including the Earth. A chemical cycle involving a biosphere is known as a biogeochemical cycle.

Explanation:

Active chemical cycling is known to occur in stars, many planets and natural satellites.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa

answer:

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