alpha particle, He nucleus
Alpha particle radiation
Uranium is a natural chemical element, radioactive. Uranium has 92 protons and electrons in the nucleus; the number of neutrons in the nucleus depends on what isotope we consider.
Polonium is a natural, radioactive, chemical element.
unstable
Yes,The element is radioactive due to the instability of its nucleus.See the related question below for more information.
Nobelium is a radioactive, artificial chemical element.
If an element is radioactive, it refers to the stability of their atomic nucleus. If that atomic nucleus is not stable, it is considered radioactive.
Actimium, plutonium, radon, radium, thorium, uranium
Uranium is a natural chemical element, radioactive. Uranium has 92 protons and electrons in the nucleus; the number of neutrons in the nucleus depends on what isotope we consider.
its nucleus is unstable
A radioactive element is an element that readily undergoes nuclear decay - the nucleus spontaneously emits subatomic particles as the element changes into another element.
Polonium is a natural, radioactive, chemical element.
Californium is an artificial radioactive chemical element.
Radioactive isotope, or radioisotope.
unstable
Yes,The element is radioactive due to the instability of its nucleus.See the related question below for more information.
Mendelevium is an artificial chemical element, radioactive, unstable.
Yes, lawrencium is an artificial, radioactive chemical element.