BIOL 112 Chapter Notes - Chapter 2: Chemical Polarity, Unpaired Electron, Relative Atomic Mass
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BIOL 112 Full Course Notes
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Chapter 2: small molecules and the chemistry of life. Living world is composed of same set of chemical elements as rest of universe. All matter is composed of atoms -> has nucleus (protons and neutrons) and electrons. All matter has a volume and mass. Mass of proton serves as a standard unit of measure called dalton (da) or atomic mass unit (amu) One proton/neutron = 1 da or 1. 7x10^-24 grams. One electron = 0. 0005 da or 9x10^-28. Electrons determine how atoms will combine with other atoms to form stable associations. Neutron has a 0 unit of charge (is neutral) Atoms are electrically neutral b/c number of electrons equals number of protons. Atoms are often represented by a bohr model - it is inaccurate b/c it exaggerates the space occupied by nucleus and it. An element consists of only one kind of atom. Distinguishable properties include their mass and how they interact with other atoms.