Radioactive metals are unstable as their nuclei is large and do not have a strong binding force as the smaller elements. If a neutron is collided onto a radioactive nuclei, they split into smaller atoms like Uranium splits into Barium and Krypton. Since they are unstable, they have a half life of varying times which range from the age of the earth to nanoseconds for recently discovered elements
Due to unstable atomic structures (or a weak nuclear force), radioactive materials release alpha particles as radiation.
As a radioactive and unstable element roentgenium can be dangerous.
When an isotope is unstable, it is said to be radioactive.
It isn't really an ELEMENT that is unstable, but an ISOTOPE. That means that in general, for the same element, some atoms will decay, and some will not - the difference being the number of neutrons in the nucleus.
Unstable isotopes are radioactive isotopes, can disintegrate and emit radiations.
It's Nuclei, the past answers are wrong.
Radioactive substances are unstable as a result of the extra neutrons present in the nuclei of the substance. Non radioactive substances are stable.
Due to unstable atomic structures (or a weak nuclear force), radioactive materials release alpha particles as radiation.
An unstable atom is a radioactive atom.
Unstable atoms are said to be radioactive
As a radioactive and unstable element roentgenium can be dangerous.
When an isotope is unstable, it is said to be radioactive.
Radioactive elements are unstable, and the shorter the half-life, the more unstable they are.
It isn't really an ELEMENT that is unstable, but an ISOTOPE. That means that in general, for the same element, some atoms will decay, and some will not - the difference being the number of neutrons in the nucleus.
Not all isotopes are radioactive; the radioactive isotopes are unstable and emit radiations.
Unstable isotopes are radioactive isotopes, can disintegrate and emit radiations.
Mendelevium is an artificial chemical element, radioactive, unstable.