Yes it is because of its colors :D
no
As a radioactive chemical element, technetium may be dangerous to humans.
Yes, Bromine is toxic
Technetium is odorless.
Technetium was not tasted !
no
As a radioactive chemical element, technetium may be dangerous to humans.
The first element to be made artificially was technetium.
Yes, Bromine is toxic
Phenol is toxic and corrosive.
The question is toxic to what. Not all chemicals which are toxic to humans are toxic to bacteria, and some chemicals which are toxic to bacteria are harmless to humans (which is why we can have antibiotics). There are chemicals (like Hydrogen Sulfide) which are very toxic to mammals that SOME bacteria eat as food. But there are other chemicals like chlorine which are toxic to both humans and bacteria. So the question does not have a simple answer.
No
yes
yes
Technetium exist in nature only in ultratraces; being unstable technetium technetium was lost by radioactive decay.
Technetium is odorless.
Technetium is not from Japan.