BSCI 105 Lecture Notes - Lecture 2: Valence Electron, Electron Shell, Mass Number

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Red elements are acidic groups, blue are basic groups. These interactions depend on the chemical structure of the molecules (the arrangement of the atoms that make up the molecule) and the physical properties of the atoms. Four types of atoms make up >96% of the human body. Oxygen - 65% because of amount of h20 in body. An element is a substance that can not be broken down by a chemical reaction and contains only one kind of atom. A compound contain more than one kind of atom and can be broken down into other chemical substances. The atoms are present in a fixed ratio. Nucleus: one or more protons, one or more neutrons. Electrons have a charge of -1 and are located in shells around the nucleus. Outermost shell is the valence shell and defines the atoms characteristics. Atomic number: number of electrons = number of protons. Atomic mass: sum of the masses of protons and neutrons.

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