FRANCIUM
Some very simple informations: Uranium is a metal, actinides group, toxic, radioactive, atomic number 92, atomic mass 238,02891. Uranium has three natural isotopes and approx. 25 artificial isotopes. Some isotopes are fissiles. Used especially in nuclear reactors and nuclear weapons.
Chlorine
polonium
Radioactive element of either Actinide/Lanthanide Series
Actinium is the first member of the actinoids family.Actinium is a solid, inner transition metal, radioactive, very rare.
For example francium in the group 1.
There is no group specified so it is not possible to be sure about this answer but all isotopes of promethium are radioactive.
Curium is an artificial element, radioactive, unstable, metal , solid, a member of the actinides group.
Californium is a metal, solid, artificial, radioactive, member of the actinoids group.
All elements have radioactive isotopes. Add a couple of hundred neutrons, and any stable element becomes radioactive.Technetium, promethium, and anything heavier than bismuth (element 83) will have radioactive decay.radio active elements can be uranium,radium,thorium,polonium,actinium etc.usually all elements of atomic number higher than 82 show radioactivity.
Some very simple informations: Uranium is a metal, actinides group, toxic, radioactive, atomic number 92, atomic mass 238,02891. Uranium has three natural isotopes and approx. 25 artificial isotopes. Some isotopes are fissiles. Used especially in nuclear reactors and nuclear weapons.
Platinum is a metallic, solid, radioactive chemical element; now it is considered a natural element. Plutonium is a member of the actinides group.
All isotopes of technetium are radioactive. Technetium is found only in trace quantities in nature, and then usually only in certain ores where it is a product of radioactive decay. All of the technetium used is synthetic.
Californium is a solid metal, an artificial element, radioactive, unstable, a member of the actinoids group.
Einsteinium is an artificial chemical element, unstable, radioactive, member of the actinides group, atomic number 99.
Radium is in the 2nd group of the periodic table. It is a radioactive element. It is bright white in color when freshly prepared.Radium is a metallic element in group 2. It is a radioactive element with many isotopes. Radium was discovered by Marie Curie. It's atomic number is 86 and electron configuration is [Rn] 7s2.
Einsteinium is an artificial chemical element, unstable, radioactive, member of the actinides group, atomic number 99.