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In the previous chapter, you learn that valence electrons of atom can be shown in a simple way with an electron dot diagram. The Hydrogen atom is shown as H because of its one valence electron. Structures of molecules that are held together by covalent bonds can be diagram by Lewis electron - dot structures. Hydrogen molecules are shown in Figure 1. Share pair of electrons is shown as two dots in between two H symbols. This is called a single covalent bond, when two atoms are joined by sharing of one pair of electrons. Single covalent bond can also be shown by dash in between two symbols. The structural formula is a formula that shows arrangement of atoms in molecule and represents covalent bonds between atoms by dashes.
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