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All elements have at least some radioactive isotopes.

For some elements no radioactive isotopes are known except those that are synthetic (see link to related question below).

For some other elements, there are both radioactive isotopes and stable isotopes in nature. (see link to related question below).

Some elements only have radioactive isotopes, and these are found in nature in at least trace quantities, they include (ordered by atomic number; those marked with * are normally only found in trace amounts in ore as radioactive decay products, and those with ** are distributed radioactive decay products found in trace amounts):

Period 5: technetium*

Period 6: promethium*, bismuth, polonium*, astatine*, radon**

Period 7: francium*, radium*, actinium*, thorium, protactinium*, uranium, neptunium*, plutonium**

The fact that all isotopes of bismuth are radioactive was only recently discovered.

Some elements are only know as a result of synthesis by human activity, and these are as follows:Period 7: americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium, rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, copernicium, and anything new that might come along.

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13y ago
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14y ago

bismuth

thorium

uranium

plutonium

curium

technetium

neptunium

protactinium

americium

radium

berkelium

californium

polonium

actinium

promethium

einsteinium

fermium

mendelevium

radon

dubnium

rutherfordium

lawrencium

astatine

bohrium

seaborgium

hassium

nobelium

francium

ununtrium

roentgenium

meitnerium

ununbium

darmstadtium

ununquadium

ununhexium

ununoctium

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6y ago

Not all elements are radioactive. Only elements having atomic number more than 83 are considered having radioactive nature (radio-isotopes). The elements with atomic number less than 83 are considered stable.

OLDER ANSWER:Theoretically they all are, it is just a matter of decay-speed(radioactivity).

In general, the elements with higher numbers (more protons and neutrons) are more unstable, and thus decay faster.

26 Iron is considered stable, but higher then 84 Polonium is considered active.

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9y ago

Radioactivity refers to the emission of ionizing particles which results from the spontaneous disintegration of atomic nuclei. Some examples of radioactive elements are uranium and plutonium.

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14y ago

Uranium

Plutonium

And many isotopes are radioactive [for example K 40]

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12y ago

There is two companies that are known for selling contemporary items. The most well known being Ikea, the second most important being Walmart.

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13y ago

Mainly radioactive Carbon-14 14C

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Q: Which are radioactive elements in periodic table?
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Related questions

What are radioactive elements on the periodic table?

In general, the elements with higher atomic numbers are the most radioactive and they are found at the bottom of the Periodic Table of Elements


Where do radioactive atoms start on the periodic table?

After lead, all elements on the periodic table have only radioactive isotopes.


Region of the periodic table where most radioactive elements are found?

Group 3 of the periodic table contains many of the radioactive elements.


What families have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


What element family have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


Name 10 elements in the periodic table that are radioactive?

Hydrogen


What 3 families contain no radioactive elements?

All periodic table groups contain elements with radioactive isotopes.


What are the ten elements in thre periodic table that are radioactive?

all elements after uranium (atomic number 92) are radioactive.


Which atoms will always be radioactive?

Almost all the lower elements in the periodic table will always be radioactive.


What elements on the periodic table is a radioactive element?

Lanthanides and Actinides probably


The period of elements that are all radioactive?

All elements comprising the period 7 in the periodic table are radioactive. In total this period has 32 elements.


What period on the periodic table of elements contains radioactive elements and what are they called?

it was found in 1896. you can not find them on the periodic table. you may find some, but often some are.