Radioactive Elements:

________: radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process.

During ________, a neutron in an unstable nucleus changes into a negatively charged beta particle + a proton.

________ are almost always accompanied by gamma radiation.

________: involve the particles in the nucleus of an atom.

They behave chemically like ________ of an element.

when an element (uranium) spontaneously emits radiation, named by Marie Curie, worked on by her, her husband, and Henri Becquerel

________: fast- moving electron given off by a nucleus during radioactive decay.

They have no charge + do not cause a change in either the ________ or the atomic.

1896- ________ Henri Becquerel accidentally discovered the effects of Radioactive Decay.

________: consists of two protons + two neutrons; positively charged.

________: process where atomic nuclei of radioactive isotopes release fast- moving particles and energy.

process where atomic nuclei of radioactive isotopes release fast-moving particles and energy

involve the particles in the nucleus of an atom

process in which atomic nuclei split apart

process in which atomic nuclei join together

French scientist Henri Becquerel accidentally discovered the effects of Radioactive Decay

when an element (uranium) spontaneously emits radiation, named by Marie Curie, worked on by Marie Curie, her husband chemist Pierre Curie, and Becquerel who presented his findings to the Curies

consists of two protons + two neutrons; positively charged

fast-moving electron given off by a nucleus during radioactive decay

consist of high-energy waves, similar to x-rays

determining the ages of fossils, tracing the steps of a chemical reaction and industrial processes, diagnosing and treating disease, and providing sources of energy

(of a radioactive substance) the length of time needed for half of the atoms of a sample to decay, different for each radioactive isotope (can range from less than a second to billions of years)

when scientists measure the amount of carbon-14 in a preserved fossil to calculate how many half-lives have passed since it died and estimate the age

radioactive isotopes that can be followed through the steps of a chemical reaction or an industrial process