The question assumes far too many things that are not factual.
Beneath the question is the assumption that nanobots can reproduce; they cannot. The only nanobots that can reproduce themselves are the ones that exist in fiction.
Tin is a naturally occurring metallic element. It is only created in supernova explosions. Radioactive tin can be created in nuclear reactors.
The ozone is naturally create. Sunlight and thunder help in its formation.
No, argon is a noble gas that is naturally present in Earth's atmosphere and is not created by lightning. Lightning can generate ozone and nitrogen oxides in the atmosphere, but not argon.
Metallic K.O. was created in 1976.
The Metallic Muse was created in 1972.
Black Metallic was created in 1991.
Metallic Skink was created in 1874.
Metallic Blues was created in 2004.
Metallic Ringtail was created in 1839.
Metallic Spheres was created in 2009.
Metallic-green Tanager was created in 1840.
Clouds Taste Metallic was created on 1995-09-19.