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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.
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∙ 14y ago
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∙ 9y agoPeriod 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.
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∙ 11y agothe f-block elements (i think the actinides)
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∙ 13y agoActinoids, lower part of f-block of periodic table mostly contains radioactive elements.
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∙ 11y agoThe actinides (or all elements from atomic number 93 are radioactive).
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∙ 11y agoRadioactive elements are in the periods 6 and 7;only technetium is in the period 5.
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∙ 11y agoInner Transition Metals.
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Which group contains only representative elements?
The grouping Al, Mg, and Li contains only representative elements. Al is aluminum, Mg is magnesium, and Li is the element Lithium.
What group of elements contains only nobel gasses?
Periodic column 18 or VIII contains only noble gases. None of them have won a Nobel prize.
How are the elements with atomic numbers 43 and 61 are unique?
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.
What are two elements in group VIIA of the periodic table?
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.
Is bromine radioactive?
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.
Which family of elements only contains one nonmetal element?
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
Can one element change into a different element?
Yes, but only if it is radioactive. Radioactive elements change into different elements through radioactive decay.
Which group contains only representative elements?
The grouping Al, Mg, and Li contains only representative elements. Al is aluminum, Mg is magnesium, and Li is the element Lithium.
Which group contains element that is liquid at STP?
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
Which groups of elements contains only noble gases?
This is the group 18 of the periodic table of Mendeleev.
What group of elements contains only nobel gasses?
Periodic column 18 or VIII contains only noble gases. None of them have won a Nobel prize.
Are all elements periodically change to become new element s?
No. Only radioactive elements, which undergo radioactive decay can change to different elements.
Which elements posses only one electron in their valence shell and what are they called and what is the radioactive element of this group?
These are the alkali metals; the radioactive one is francium (Fr).
How many elements are made only in a laboratory?
How many radioactive elements are made only in a laboratory?
What is the family name of for Technetium?
Transition metals. in fact, it is the Only radioactive transition metal!
How are the elements with atomic numbers 43 and 61 are unique?
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.
What does nobelium and berkelium have in common?
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.
