BIOL 1111 Lecture Notes - Lecture 2: Surface Tension, Dna Replication, Electronegativity

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Solid, liquid, gas, made of elements, living and non-living. Elements - cannot be broken down into smaller units with the same properties. Made up of only one type of atom. Element made of one type of atom; subatomic particles. Orbits around the nucleus and are attracted to positive nucleus; only 2 electrons per orbit. Held in shell via potential energy; farther shells require more energy. Each lower level must be filled before the next will receive electrons. Atoms are most stable when 8 electrons are in their final shell. Isotopes - atoms of an element with different # of neutrons. Released energy and subatomic particles = radioactivity. Radioactive isotopes reacts the same as non-radioactive. Kills cells, damages dna, sterilization, cancer causing. Molecule - the smallest part of a compound that retains the properties of that compound. Bonds formed by interaction of electrons; interactions contain energy, breaking bond releases energy. Ionic - gain or loss of electron to/from another atom.

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