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For elements with no stable isotopes (like Ununoctium), the mass number of the isotope with the longest half-life is used. That's 294.

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Related Questions

Which element has the greatest average atomic mass?

Ununoctium.


What has the greatest atomic mass?

The element Ununoctium, Uuo, has an atomic mass of 293.


What isotope has the largest atomic mass?

The relative atomic mass of ununoctium is estimated as 294.


What element has greatest atomic mass?

Ununseptium and Ununoctium are currently tied.


What is the element with the heaviest atomic mass?

Ununseptium and Ununoctium are currently tied.


What is the atomic number of ununoctium?

Ununoctium, with the chemical symbol Uuo, has the atomic number 118.


What is the radius of ununoctium?

The estimated atomic radius of ununoctium is 152 pm.


What the ununoctium atomic structure ununoctium?

The isotope ununoctium-294 has 118 protons and electrons and 176 neutrons.


What is the average attomic mass for titanium?

The average atomic mass for titanium is 47.867.


What is the average atomic mass of lithuim?

The average atomic mass of Lithium (Li) is 6.941.


Which halogon has the greatest atomic mass?

Radon, unless you count the synthetic Ununoctium. But because it is radioactive, highly unstable, and synthetic, I would discount it for now. It does however have the largest atomic mass for any known atomic substance. So, the answer is Radon.


What is the average atomic mass compared to atomic mass?

The average atomic mass is a weighted average of the masses of all isotopes of an element, taking into account their abundance. The atomic mass listed on the periodic table is the weighted average of all naturally occurring isotopes of the element. So, they are essentially the same thing, with the average atomic mass being a more specific term.