BIOA01H3 Chapter 2: Chapter 2 Notes

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BIOA01H3 Full Course Notes
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BIOA01H3 Full Course Notes
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I t is electrons, however, that determine how atoms will interact in chemical reactions. About 98 percent of the mass of every living organism (bacterium, turnip, or human) is composed of just six elements: carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur. Hydrogen doesnt have a neutron unless its an isotope. But some, called radioisotopes, are unstable and spontaneously give off energy in the form of (gamma) radiation from the atomic nucleus. Known as radioactive decay, this release of energy transforms the original atom. These transformations can extend even to a change in the number of protons, so that the original atom is now a different element. (beta), or (alpha), radiation from. 60co (cobalt-60) is used in medical practice to kill cancer cells. The behaviour of electrons explains how chemical reactions occur. The region of space where the electron is found at least 90 percent of the time is the electron"s orbital.

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