The final lesson, Frosty the Snowman Meets His Demise: An Analogy to Carbon Dating, is based on gathering evidence in the present and extrapolating it to the past.To do this lesson and understand half-life and rates of radioactive decay, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.The elements with atomic number greater than 82 are radioactive.The is a measure of how quickly on average a radioactive nuclei will take to decay.In 1896, Bequerel, a French physicist discovered that crystals of Uranium salts emitted penetrating rays similar to X-rays which could fog photographic plates.
actinide series,a series of radioactive metallic elements in Group 3 of the periodic table.
Geological processes have helped to create many iconic features on Earth.
Processes, such as plate tectonics, are what shapes the face of the Earth.
The reason is that energy and frequency of a gamma ray which is emitted by a radioactive element, is far beyond that of the radio band of electromagnetic spectrum! Every nucleus contains neutrons as well as protons.
Neutrons are neither positively charged, nor negatively charged, they are neutral particles. As you might remember from high school physics, like charges repel each other while unlike charges attract each other.
The name 'radioactive' may suggest to you that radioactive elements radiate radio waves, but unfortunately that is not so!