Chemical Bonding Worksheets Page 2
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22Recognize the charges formed by the Representative Elements
+
Group IA elements → +1 charge: Li
("+" = "+1")
+2
Group IIA elements → +2 charge: Mg
+3
Group IIIA elements → +3 charge: Al
-3
Group VA elements → –3 charge: N
-2
Group VIA elements → –2 charge: O
–
Group VIIA elements → –1 charge: F
("–" = "–1")
IONIC BONDS
Ex. 1 Give the Lewis electron-dot formula below for each of the following atoms and ions:
sodium
magnesium
chlorine
oxygen
sodium ion
magnesium ion
chloride ion
oxide ion
Example: Draw the electron-dot formulas representing each of the following:
a. sodium atom + chlorine atom react to form sodium chloride (sodium ion + chloride ion)
b. magnesium atom + oxygen atom react to form magnesium oxide
c. aluminum atom + nitrogen atom react to form aluminum nitride
Thus, in reality, metal atoms transfer valence electrons to nonmetal atoms
→ positively charged cations and negatively charged anions
→
– Ions come together
ionic compound = 3D network of ions
CHEM 121 Tro Chapter 10 F2012
page 2 of 22
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