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They don't so much disappear as become converted to a different isotope - as they throw off particles. If you took the remaining material and added the mass of the particles released as radiation, you should still get the same mass as the original material before the radioactive decay.
What else can I help you with?
What is stable and unstable isotopes?
Some isotopes are stable, others are unstable.
Which isotopes are most likely to decay?
Isotopes with a high atomic number and/or an unstable ratio of protons to neutrons are more likely to decay. Generally, isotopes further from the line of stability on the periodic table are more likely to undergo radioactive decay.
What our daughter isotopes?
"Daughter isotopes" are called the decay products of an radioactive isotope.
When does an unstable isotope break down into a stable isotope?
The process is called decay, or sometimes nuclear decay. A link can be found below.
What element is formed when neptunium desintegrates?
Neptunium-237 decay to protactinium-233.Other isotopes of Np decay to other daughter isotopes.
When did roentgenium disapear?
All radio-actives isotopes disappear by radioactive decay.
Do elements disappear when they decay?
Yes, elements can change into different elements when they decay, but they do not disappear completely.
What does ununhexium decay into?
The decay products of ununhexium (after alpha decay) are isotopes of ununquadium.
Are most isotopes stable?
No, most isotopes are not stable. Many isotopes are radioactive and decay over time, releasing radiation in the process. Only a few isotopes are stable and do not undergo radioactive decay.
What is stable and unstable isotopes?
Some isotopes are stable, others are unstable.
Which isotopes are most likely to decay?
Isotopes with a high atomic number and/or an unstable ratio of protons to neutrons are more likely to decay. Generally, isotopes further from the line of stability on the periodic table are more likely to undergo radioactive decay.
What is a Toxic metallic element decay product of uranium?
The end products of uranium isotopes decay chain are the isotopes of lead.
What are the products of bohrium?
The decay products of bohrium isotopes are dubnium isotopes.
What our daughter isotopes?
"Daughter isotopes" are called the decay products of an radioactive isotope.
When does an unstable isotope break down into a stable isotope?
The process is called decay, or sometimes nuclear decay. A link can be found below.
What element is formed when neptunium desintegrates?
Neptunium-237 decay to protactinium-233.Other isotopes of Np decay to other daughter isotopes.
What do uranium isotopes decay into?
See the link below for radioactive decay chains.
