History of the Discovery of Radioactivity (5)

Types of radioactive radiation (1)

alpha particles (alpha radiation), α

Types of radioactive radiation (2)

beta particles (beta radiation), β

Types of radioactive radiation (3)

gamma ray, γ

Definition of radioactive decay

Is a random and spontaneous process where an unstable nucleus emits radioactive radiation until the nucleus becomes more stable

Examples of radioactive elements that have unstable nuclei and decay spontaneously by emitting radioactive radiation (1)

Carbon-14 (C-14)

Examples of radioactive elements that have unstable nuclei and decay spontaneously by emitting radioactive radiation (2)

Radon-222 (Rn-222)

Examples of radioactive elements that have unstable nuclei and decay spontaneously by emitting radioactive radiation (3)

Thorium-234 (Th-234)

Examples of radioactive elements that have unstable nuclei and decay spontaneously by emitting radioactive radiation (4)

Uranium-238 (U-238)

The first unit of radioactivity introduced

Was curie (Ci)

The unit to measure the rate of unstable nuclei decay

Is measured in curie