HUBS1403 Chapter Notes - Chapter 2: Hydrophile, Hexose, Dipeptide

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Matter exists in three states: solid, liquid, gas: solid: compact, has definite shape and volume. Lesser elements = 3. 6%: oxygen, carbon, hydrogen, nitrogen, calcium, phosphorous, potassium, sulphur, sodium, chlorine, magnesium. Most of the atoms in the body are joined into compounds. Water (h2o) and sodium chloride (nacl), common table salt, are compounds. The force of attraction that holds together ions with opposite charges is an ionic bond: positively and negatively charged ions are attracted to one another(cid:1680)opposites attract, consider sodium and chlorine atoms, the components of common table salt. If sodium loses this electron, it is left with the eight electrons in its second shell, which becomes the valence shell. As a result, however, the total number of protons (11) exceeds the number of electrons (10). Thus, the sodium atom has become a cation , or positively charged ion. If chlorine gains an electron from a neighboring atom, it will have a complete octet in its third electron shell.

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