The actinoids (formerly actinides) are all unstable metallic elements. The period 7 elements with atomic numbers from 89 (actinium, for which the group is named) through 103 comprise these elements. A link can be found below.
Period sever on the Periodic Table contains all the radioactive elements. Iron, in period 6, is the last stable element on the table, before the radioactive elements.
the f-block elements (i think the actinides)
Actinoids, lower part of f-block of periodic table mostly contains radioactive elements.
The actinides (or all elements from atomic number 93 are radioactive).
Radioactive elements are in the periods 6 and 7;only technetium is in the period 5.
Inner Transition Metals.
The grouping Al, Mg, and Li contains only representative elements. Al is aluminum, Mg is magnesium, and Li is the element Lithium.
Periodic column 18 or VIII contains only noble gases. None of them have won a Nobel prize.
The element with atomic numbers 43 (Technetium) and 61 (Promethium) are unique because they are the only radioactive elements before the start of the bulk of the radioactive elements. The bulk of the radioactive elements begins at atomic number 84 (Polonium). These are significant as they aren't primordial and are only found due to radioactive decay.
That's not a very valid question becase you could argue that all the elements in that particular group are important. There are at least 4 common ones there, which are carbon, silicon, lead, and tin.
Fluorine has probable a natural radioactive isotope (F-18) but only as traces.Chlorine has a natural radioactive isotope (Cl-36) but only as traces.Bromine hasn't natural radioactive isotopes.Iodine has probable a natural radioactive isotope (I-125) but only as traces.Astatine has only radioactive isotopes.
Group 4 (Now 14) of the Periodic Table contains only one non-metal; Carbon (C). All the rest of the elements in this group are metals. The metals in Group 4(14) are;SiliconGermaniumTinLead
Yes, but only if it is radioactive. Radioactive elements change into different elements through radioactive decay.
The grouping Al, Mg, and Li contains only representative elements. Al is aluminum, Mg is magnesium, and Li is the element Lithium.
Group 17 (old name: VIIA) contains Bromine andGroup 12 of the transition elements contains MercuryBoth elements are liquids at room temperature, RTP but only Mercury, Hg is a liquid at STP
This is the group 18 of the periodic table of Mendeleev.
Periodic column 18 or VIII contains only noble gases. None of them have won a Nobel prize.
No. Only radioactive elements, which undergo radioactive decay can change to different elements.
These are the alkali metals; the radioactive one is francium (Fr).
How many radioactive elements are made only in a laboratory?
Transition metals. in fact, it is the Only radioactive transition metal!
The element with atomic numbers 43 (Technetium) and 61 (Promethium) are unique because they are the only radioactive elements before the start of the bulk of the radioactive elements. The bulk of the radioactive elements begins at atomic number 84 (Polonium). These are significant as they aren't primordial and are only found due to radioactive decay.
Berkelium and nobelium are members of the actinides group, solid metals, radioactive elements, unstable elements, artificial elements, very difficult to prepare extremely small quantities, only some compounds are known, etc.