Similarly, the number of electrons in the valence shell also determines ion formation. The number of bonds that an element can form is determined by the number of electrons in its valence shell (Fig. When an electron, or dot, from one element is paired with an electron, or dot, from another element, this makes a bond, which is represented by a line (Fig. The oxygen atom forms two bonds, one with each of two hydrogen atoms therefore, the formula for water is H 2O. The single electrons match up to make pairs (Fig. One oxygen atom can share its unpaired electrons with two hydrogen atoms, each of which need only one additional electron. To fill its valence shell, oxygen needs two additional electrons, and hydrogen needs one. In the formation of water, an oxygen atom has two unpaired electrons, and each hydrogen atom has one (Fig. First, determine how many atoms of each element are needed to satisfy the octet rule for each atom. 2.29 gives an example of how to make a Lewis dot structure. In order to form a covalent bond, each element has to share one unpaired electron.įig. The number of bonds that each element is able to form is usually equal to the number of unpaired electrons. The first four electrons are placed as single electrons, then the remaining four are paired. There can be up to eight dots, for eight valence electrons. 2.28 Dots are placed around the symbol of the element to represent the number of valence electrons in the element. A table of Lewis dot symbols of nonmetal elements that form covalent bonds is shown in Fig. Lewis dot structures are one way to represent how atoms form covalent bonds. It takes two electrons to make a covalent bond, one from each bonding atom. ![]() Covalent bonding is the type of bond that holds together the atoms within a polyatomic ion. Covalent bonding generally happens between nonmetals. This is a covalent bond, a bond in which atoms share electrons. This is how hydrogen and oxygen share electrons they each have an electron that they can share in a bond. The bones represent one of their electrons. ![]() Imagine two puppies, each with a bone (Fig. ![]() The hydrogen and oxygen atoms in a water molecule, however, are bonded by sharing electrons rather than by transferring them. Ions exert electrostatic force on each other, which forms ionic bonds. Ionic compounds, such as sodium chloride (NaCl), are formed by a transfer of electrons that creates ions.
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