Einsteinium
All the existing chemical elements, natural or artificial, are in the periodic table of Mendeleev.
Since that was a supernova explosion, that would most likely produce all elements that occur naturally, except hydrogen (element #1).
Radon is one of the noble (inert gases), is radioactive (half-life of about 4 days, decaying to polonium), and is naturally occurring in relatively small quantities. Whether or not it is the heaviest of this group, I am not sure...perhaps someone else can verify.
Chalk was not invented by anyone; it is a naturally occurring mineral; and has been used by people since the stone age. Nobody knows who first discovered and used it.
Magnetic domains have the tendency to align with magnetic fields. The Earth's magnetic field is relatively weak, but I would expect SOME alignment.
Einsteinium
einsteinium
Einsteinium.
All the existing chemical elements, natural or artificial, are in the periodic table of Mendeleev.
Explosion is not a tm so cannot be found anywhere. However a variety of Pokemon learn Explosion naturally such as Koffing, Geodude and Voltorb.
Thallium, discovered in 1861, does occur naturally, but not in its pure form.
Natural
combustion is purely a chemical reaction, need not to be natural while explosion is naturally chemical energy. explosion requires expansion of volume while this is not necessary in case of combustion.
Computers are not a naturally occurring phenomenon, they can not be "discovered" only invented.
The Hundreds of different Indian languages were not discovered. They evolved naturally among the people that spoke them.
Matter naturally exist, no need to be discovered.
Since that was a supernova explosion, that would most likely produce all elements that occur naturally, except hydrogen (element #1).