Question 9.1: Use the Lewis model to predict the formula for the compound ...
Use the Lewis model to predict the formula for the compound that forms between calcium and chlorine.
| Draw Lewis symbols for calcium and chlorine based on their respective number of valence electrons, determined from their respective group number in the periodic table. | Ca: :\overset{..}{\underset{.}{Cl}}: |
| Calcium must lose its two valence electrons (to be left with an octet in its previous princi-pal level), while chlorine only needs to gain one electron to obtain an octet. Draw two chlo-ride anions, each with an octet and a 1- charge, and one calcium cation with a 2+charge. Draw the chloride anions in brackets and indicate the charges on each ion. | Ca^{2+}2[:\overset{..}{\underset{..}{Cl}}: ]^{-} |
| Finally, write the formula with subscripts that indicate the number of atoms. | CaCl_{2} |
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