Flashcards in Chemistry-Radioactivity Deck (10)
Atoms of the same element that differ in the number of neutrons. In the element.
Describes a nucleus that does not change spontaneously. The protons and neutrons are held together strongly.
Describes an atom in which the neutrons and protons in the nucleus are not held together strongly.
A radioactive. Isotope
Radiation from the nucleus of an atom, consisting of alpha or beta particles, or gamma rays.
Positively charged nuclei of helium atoms, consisting of two protons no two neutrons.
Charged particles that have the same size and mass as electrons
Electromagnetic radiation. Produces in nuclear reactions. No mass. Travel at speed of light.
Time in which half the radioactive atoms takes to decay, or change into a different element.