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Name Date _. Class. ; IONIC AND METALLIC BONDING Formulas of lonic Compounds Fel Elements exchange electrons in ionic bonds. Cations form from metals by the loss of ; valence electrons. Anions form from nonmetals by the gain of electrons. Ionic bonds form as the result of oppositely charged ions attracting one another. An ionic compound always contains at least one positive ion (cation) and one negative ion | (anion). These ions must combine in such a way as to produce a neutral compound. | The formula unit of an ionic compound represents the smallest sample of an ionic ' compound that has the composition of that compound. This formula unit will reflect | the balance of charges of the compaund’s ions. The use of electron dot formulas is a helpful tool in predicting formulas of ionic compounds. This worksheet will help to show you how to write formulas of various ionic compounds. For the element magnesium, give the following: a. the number of valence electrons b. the electron dot formula c. the formula for its most stable ion Solution a, Magnesium has 12 electrons, 10 of which are in inner, filled energy levels (1s? 25? 2p), The two remaining electrons are valence electrons. ,; b. The electron dot formula for magnesium is *Mg:. | ¢. The formula for the most stable ion of magnesium is Mg?*. You Try It 1. How many valence electrons does the element iodine have? What is the formula for iodine’s most stable ion? ! Your Solution Example B . 7-2 Use electron dot formulas to predict the formula of the ionic compound formed when sodium and sulfur combine, Solution First write the correct electron dot formulas for the two elements involved in the compound. . . Na: and «$! Remember that metals lose valence electrons, and nonmetals gain electrons in order to achieve electron configurations resembling those of the noble gases. Sufficient numbers of atoms of each element must be included in the formula so that the 
