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All elements have unstable isotopes so the answer would be everywhere. However if you mean 'elements with only unstable isotopes' then

  • number 43 Technetium
  • number 61 Promethium
  • everything above 92
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Are radioactive substances the last period of elements (at the bottom of the chart)?

Radioactive substances are not exclusive to the last period of elements on the periodic table, but many of the heaviest elements, particularly those in the actinide and transactinide series, are radioactive. These elements, found at the bottom of the periodic table, typically have unstable nuclei that decay over time. However, there are also radioactive isotopes of lighter elements scattered throughout the periodic table. Thus, while many radioactive elements are at the bottom, not all radioactive substances belong to this category.


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

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


Are the heaviest atoms found at the bottom of the periodic table?

Yes, the heaviest atoms, which have the most protons and electrons, are found towards the bottom of the periodic table in the actinide and transactinide series. These elements have high atomic numbers and are generally unstable and radioactive.


Where do radioactive atoms start on the periodic table?

Radioactive atoms can be found throughout the periodic table. They can be naturally occurring elements like uranium and thorium, or they can be created synthetically in laboratories by bombarding stable atoms with particles.


How would you describe the elements that are listed after plutonium?

The elements listed after plutonium on the periodic table are americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, lawrencium. These elements belong to the actinide series and are synthetic, meaning they are not found in nature but are produced in laboratories through nuclear reactions.

Related Questions

What are radioactive elements on the periodic table?

Some examples of radioactive elements on the periodic table include uranium, thorium, radium, and plutonium. These elements have unstable atomic nuclei that decay over time, emitting radiation in the process.


Are radioactive substances the last period of elements (at the bottom of the chart)?

Radioactive substances are not exclusive to the last period of elements on the periodic table, but many of the heaviest elements, particularly those in the actinide and transactinide series, are radioactive. These elements, found at the bottom of the periodic table, typically have unstable nuclei that decay over time. However, there are also radioactive isotopes of lighter elements scattered throughout the periodic table. Thus, while many radioactive elements are at the bottom, not all radioactive substances belong to this category.


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

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


Which group contains only radioactive elements?

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.


Are the heaviest atoms found at the bottom of the periodic table?

Yes, the heaviest atoms, which have the most protons and electrons, are found towards the bottom of the periodic table in the actinide and transactinide series. These elements have high atomic numbers and are generally unstable and radioactive.


What are synthesizers?

Synthetic elements are unstable chemical elements not naturally found on the earth. They are synthesized in the laboratory. All of them are unstable and radioactive in nature, which means they emit radiations and decay into other 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.


Where do radioactive atoms start on the periodic table?

Radioactive atoms can be found throughout the periodic table. They can be naturally occurring elements like uranium and thorium, or they can be created synthetically in laboratories by bombarding stable atoms with particles.


How are uranium polonium and radium alike?

Uranium, polonium, and radium are all radioactive elements found in the same actinide series of the periodic table. They all have unstable nuclei that undergo radioactive decay, emitting harmful radiation in the process. Additionally, they have various industrial applications, particularly in the fields of energy production and medicine.


Is Ununoctium a gas?

Yes it is a gas! Ununoctium is a radioactive chemical element which is classified in the noble gases on the periodic table of elements. It is also presumed to be a colourless gas! =]


How many radioactive elementsare found in nature?

There are over 340 naturally occurring radioactive elements, but only around 70 of these are found on Earth in measurable amounts. These elements have unstable nuclei that decay over time, emitting radiation in the process.


What is made up of radioactive elements?

Radioactive elements are naturally occurring elements with unstable atomic nuclei that emit radiation as they decay. Common examples include uranium, thorium, and radium. These elements can be found in minerals, rocks, and soil.