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Noble gases are placed in the group 18 of the periodic table of elements; from about 50 years noble gases are not considered as totally inert elements.

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Which element is a stable element?

A stable element is any non-radioactive element. All elements before element atomic number 84 (not including 84) - Polonium (Po) are stable elements.


Which of the elements is stable?

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Are iron elements stable?

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Which alkali metal element has no stable isotopes?

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