lead
Barium is an alkaline earth metal that is very toxic, especially in its soluble forms. Ingesting or inhaling barium compounds can lead to serious health issues such as respiratory problems, muscle weakness, and cardiac irregularities. Barium poisoning can be fatal if not treated promptly.
Beryllium is an alkaline earth metal, atomic number 4, with a low density - 1,85 g/cm3, a natural element, toxic but very useful for many technologies.
Magnesium is an Alkaline Earth element. It is a metal, and is very reactive.
Metal Beryllium is a light Metal of high thermal conductivity. Its melting point is high (1278 +/- 5 0 C) and boiling temperature 2970 0 C
Oxygen is the most abundant element in the earth's crust and is not in the boron family. Aluminum is in the boron family and is the third most abundant element in the earth's crust. Refer to the related link for a list of the 10 most abundant elements in the earth's crust and their percentages.
Plutonium is a very toxic element; also is a radioactive element.
The element 119 will be very probable an alkali metal.
Mercury is an element. It has chemical symbol Hg. It is the only metal that is liquid at room temperature, and very toxic.
No, Antimony is not radioactive, but still it is very toxic
Uranium is a natural chemical element, metal, solid, toxic, radioactive, reactive, very dense, used as fuel in nuclear reactors, used in nuclear bombs, used in alloys for tankks armors, etc.
There are many examples. Ni is a example element.
Very toxic - it was used for Chemical Warfare in WW1