Which are radioactive elements in periodic table?

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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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What is a period on the periodic table of elements?

According to quantum mechanical theories of electron configuration within atoms, each row (period) in the table corresponds to the filling of a quantum shell of electrons. You can imagine a "shell" as an area around the nucleus able to have a specific maximum number of electrons. There is a standard ( Full Answer )

What is the last element in the periodic table that is not radioactive?

We're not actually 100% certain that there are any elements that are absolutely not radioactive. Some Grand Unified Theories predict that protons are unstable over incredibly long timescales, and if so, no baryonic matter (all elements are baryonic matter) is stable over the very very long term. ( Full Answer )

Why is the table of elements named the periodic table?

The periodic table is named so because the elements are aligned in 'periods'. But it probably works the other way round. The Periodic Table has that name because it arises from Mendeleev's formulation of the Periodic Law, which he stated as "When the elements are arranged in order of increasing a ( Full Answer )

What are radioactive elements that are on the periodic table of elements?

bismuth thorium uranium plutonium curium technetium neptunium protactinium americium radium berkelium californium polonium actinium promethium einsteinium fermium mendelevium radon dubnium rutherfordium lawrencium ( Full Answer )

Elements on the periodic table of elements?

total no of elements in periodic table is 112.Some of which are still unnamed. Elements on the periodic table is classifies into metals, non-metals, semiconductors, and elements that are radioactive. Elements are arranged in increasing order of their atomic number. In a periodic table on the left ( Full Answer )

Which elements in the periodic table are radioactive?

Tc - 43 - Technetium Pm - 61 - Promethium Po - 84 - Polonium At - 85 - Astatine Rn - 86 - Radon Fr - 87 - Francium Ra - 88 - Radium Ac - 89 - Actinium Th - 90 - Thorium Pa - 91 - Protactinium U - 92 - Uranium Np - 93 - Neptunium Pu - 94 - Plutonium Am - 95 - Americium Cm ( Full Answer )

How do elements get into the periodic table of elements?

The Periodic Table is organized in rows and columns called Periods and Groups respectively. Each row (period) in the table corresponds to the filling of a quantum shell of electrons. The elements in a group have similar configurations of the outermost electron shells of their atoms (most chemical pr ( Full Answer )

Radioactive elements on the periodic table?

according to my research there are a lot of radioactive elements inthe periodic table but here are four that I choose technetium,promethium, polonium, and astatine.

On the Periodic Table of elements What is a period?

The periods of The Periodic Table is shown in the column to the left of the elements. It represents the number of "shells" or "layers" of electrons that the particular element contains. There are a total of 7 periods including the Lantanoids anf the Actinoids

Who thought of the periodic table of elements?

Many people thought of the idea, but we have given credit toDmitri Mendeleev in 1869. I think its because he took the ideafurther and inscribed detail into his table, even predicting futureelements. However, Lothar Meyer has also produced a similar versionat essentially the same time as Dmitri Mende ( Full Answer )

What are the unknown elements in the periodic table?

The four predicted elements lighter than the rare earth elements,ekaboron (Eb), ekaaluminium (Ea), ekamanganese (Em), and ekasilicon(Es), proved to be good predictors of the properties of scandium, gallium , technetium and germanium respectively, which each fill the spot in theperiodic table ass ( Full Answer )

What are the elements on the periodic table of elements?

In the words of the immortal Tom Lehrer: There's antimony, arsenic, aluminum, selenium, And hydrogen and oxygen and nitrogen and rhenium, And nickel, neodymium, neptunium, germanium, And iron, americium, ruthenium, uranium, Europium, zirconium, lutetium, vanadium, And lanthanum and osmiu ( Full Answer )

Why are there natural elements in the periodic table?

Originally according to western Oregon universities' site: "brief history of the periodic table" the creators wanted a way to track the elements. Originally it was just the elements found in nature. The man made elements came later and were added to the already widely used table. I don't have WOU'S ( Full Answer )

Where is TNT on the periodic table of elements?

TNT is not an element, it stands for trinitrotoluene and is highly explosive. It is made up of various elements from the periodic table including nitrogen, carbon, oxygen and hydrogen

All about the periodic table of elements?

The periodic table was created by Dmitri Mendeleev. It names all the elements, their atomic number, atomic mass and its ions. The atomic number tells you the number of protons and electrons.* The older periodic table was arranged by its atomic mass but in modern time is arranged by its atomic number ( Full Answer )

Why does a periodic table of elements have symbols?

The same reason anything else uses symbols: to represent information in a condensed form. Element symbols take up much less space than the full name of the element, and so can be written in a large font to make them easy to see at a glance. The full name is generally written in a much smaller font. ( Full Answer )

What on the periodic table is an element?

Everything on The Periodic Table is an element, hence the the name PERIODIC TABLE OF ELEMENTS - - - - - Well...the paper the table is printed on and the ink used to print it with are not elements, but everything else is.

The elements in the periodic tables?

i don't really know this but as you can see they let me write it so i think ... the element are the solids gas and metals in the table that have been spilt up into groups

Where are metallic elements on the periodic table?

Most metallic elements on the periodic table can be found on the left side of the table. On the bottom, the lanthanides and actinides are metals too. As you go farther right in the table (when you reach Group 13), the number of metals starts to decrease. It eventually leads to the metalloids and the ( Full Answer )

What does the elements mean on the periodic table?

Kr= krypton hope that helps you guys out who aren't as smart as some others with this type of science elements periodic table, I'm not the smartest person in science but at least i knew this really easy answer :P what the hello dude that's not it /!!?!

What are the radioactive element in the periodic table?

This is hard to answer. All elements have radioactive isotopes. Some elements have no known stable isotopes. It might be more instructive to put the periodic table aside and look at a table of nuclides instead. There's a link to one in the Related Links section.

What is the radioactive isotope in the periodic table?

A normal periodic table does not list isotopes, but elements, almost all of which occur in more than one isotope, and there is probably at least one radioactive isotope for every element. Instead of the periodic table, a table of nuclides is needed to answer this question.

What are the most radioactive elements in the periodic table?

Elements of the lanthanide and actinide series are the most radioactive. These include many elements that have such short half lives that they are never observed outside the laboratory (and are observed with great difficulty even within the laboratory). Some elements can only exist for a fraction of ( Full Answer )

What does the radioactive elements comprise a majority or the periodic table?

All elements after Uranium (U) are radioactive. Much of that is due to the fact that they are so large and unstable, that decay causes more stability. This description ignores complex quantum mechanics such as the weak force, one of the four fundamental forces, driving radioactive decay.

Why the table if the elements called a periodic table?

Because in the table the elements are arranged into "periods",elements belonging to the same period have similarphysical/chemical properties. This in tern reflects the fact thatthey have a similar number of outer shell electrons.