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7A, they are unstable, because they don't have balance number inside the protons.

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Q: What element on the periodic table is most radioactive and why?
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Related questions

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

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


Which element on the periodic table except noble gases is most electronegative?

Fluorine is the most electro negative element on the periodic table


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


What is element 7 on periodic table?

The seventh most abundent element is potassium.


What does am stand for in the periodic table?

Am stands for Americium in periodic table. It has got mass number of 95. It has got atomic mass of 243. It is a radioactive element. The half life of it's most stable isotope Am 243 is 7,370 years.


Is fluorine the most reactive element in the periodic table?

Yes, fluorine is the most reactive element on the periodic table.


Hu on the periodic table?

Hu stands for Hugium, and is the element with the most mass on the alien periodic table.


Where is the most reactive metal on the periodic table located?

This element is francium in the first group of periodic table.


What is the most electronegaitve element in the periodic table?

Fluorine


What is the most active element on the periodic table?

Francium


Which element costs the most on the periodic table?

Ununoctium


What is the most studied element in the periodic table?

carbon