Transcript REGENTS_PACK_#3REVIEW.ppt

#3) Draw dot structure of Ca (show 2 valence electrons as dots.)
Method 1, using clockwise rule, fill the top 2 electrons first, then add an
electron to the sides and bottom one at a time clockwise.
Ca
Ca
Ca
Method two: Memorize group 2 has a pair of dots.
#4) Draw dot structure of Cl (show 7 valence electrons as dots)
Method 1, using clockwise rule, fill the top 2 electrons first, then add an
electron to the sides and bottom one at a time clockwise.
Cl
Cl
Cl
Cl
Cl
Cl
Cl
Method two: Memorize group 17 has a 3 pair of dots and a single
Cl
#5) Draw dot structure of Calcium Chloride, (ionic compound)
Electronegativity of Ca
is 1.0 and Cl is 3,2
therefore the ionic
character is 2,2, IONIC
Ca
2e- + 2 Cl
Ca
Cl
Ca+2 + 2e2 Cl
-
[ Cl ] + Ca
[ Cl ]
+2
Cl
Electronegativity of Ca
is 1.0 and Cl is 3,2
therefore the ionic
character is 2,2, IONIC
Ca
2e- + 2 O
Ca+2 + 2e2 Ol
[
Ca
O
O
-2
+ Ca+2
]