Kind of vague, but if you're looking for a good time, arsenic is the answer.
Curium is a radioactive element, a strongly alpha emitter - dangerous, of course.
yes it can cause skin irretation and can be deadly if ingested
Yes. Cyanide is extremely dangerous. If ingested it is deadly.
As a radioactive and unstable element roentgenium can be dangerous.
element
Lime is not dangerous to smell in small amounts. Lime can harm the skin if touched and cause problems if ingested.
As a radioactive element mendelevium is dangerous.
such an element is As, Arsenic.
No.
Metal poisoning is a toxic accumulation of metals in the body. Some metal elements that are poisonous if ingested are mercury, lead, aluminum, arsenic and cadmium.
Arsenic
It isn't dangerous until the glass breaks. Broken glass is dangerous. The contents inside the tubing may contain mercury or other chemicals that should not be ingested.