CH110 Chapter Notes - Chapter 1: Chemical Formula, Chemical Substance, Ionic Bonding

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Extremely small, not visible to the eye. Atoms basic particles from which matter is composed. Atoms consist of a nucleus (protons and neutrons) and electrons. Atoms may be combined with others (of the same or different element) to form molecules. Atoms in molecules are associated by sharing electrons in covalent bonds. Other types of associations include coordinate covalent bonds and ionic bonding. Atoms are often represented by spheres, with different colours differentiating the different elements. Molecules- atoms when come together in orderly ways become molecules. (only takes two atoms to make one molecule, which is termed diatomic) Chemical compound: contains more than one type of element in fixed, relative amounts. This ratio is expressed as a chemical formula. Chemical formulas are composed of each element type present (chemical symbol) followed by a whole-number subscript which represents the number of atoms of the type in the molecule.

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