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Final Review Sheet

Radio Active Decays

Alpha decay occurs when the nucleus emits an alpha particle. Alpha particles have a positive charge and are equivalent in size to a helium nucleus, and so they are symbolized as . Alpha particles are the largest radioactive particle emitted. This type of radioactivity results in a decrease in the atomic number by 2 and a decrease in the atomic mass by 4. The equation below shows uranium-234 undergoing alpha decay:

I you get the Alternate Ending Assignment... Here it is!

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1. What were the motivations behind European Exploration and how did the development of colonies both by Spain and England effect relationships between colonists and mother land and colonists and the indigenous?


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CH. 1: Nature, Humanity and History ? The First Four Million Years
Most cultures have some sort of story about their origins

- In the nineteenth century, more solid evidence of our origins arose

A. African Genesis
- In the mid-ninteen hundreds, the remains of humanlike creatures excited the masses, but were controversial

i. Interpreting the Evidence

In 1856 the first humoid fossils were found in Neander Valley

Three years after, Charles Darwin argued the time frame of biological life in ?On the Origin of Species?