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IONIC BONDING Involves transfer of electronsInvolves transfer of electrons –Electrons Lost by Metal = Electrons Gained by Nonmetal Ions are formed (cation +)(anion -)Ions are formed (cation +)(anion -)
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TOPIC: Ionic Bonding
Do Now: Which terms are used to identify pure substances?
A. an element and a mixture
B. an element and a compound
C. a solution and a mixture
D. An mixture and a compound
Ionic: Metal + Nonmetal• Metals: lose valence electrons
–form cation (+ ion)
• Nonmetals: gain electrons –form anion (- ion)
Ionic: cation (+ ion) + anion (- ion)
IONIC BONDING
• Involves transfer of electrons– Electrons Lost by Metal = Electrons Gained by Nonmetal
• Ions are formed (cation +)(anion -)
Review: Metals are losers!• Na configuration 2-8-1• Ne configuration 2-8• Na loses 1 electron → Na+1
– Na+1 configuration is 2-8! (Ne)
• What will take the valence electron from Na?? A nonmetal
Na metal
Review: Nonmetals are winners!• Cl configuration 2-8-7• Ar configuration 2-8-8• Cl gains 1 electron → Cl-1
– Cl-1 has the configuration 2-8-8! (Ar)
• What will donate an electron to Cl ??
Cl2 (g)
A metal
• NOTE: the elements have very different physical properties than the compound they form
Since Ionic Compounds need + ion and – ion to form, they can actually contain more than one nonmetal or
even be formed from all nonmetals if they have something called a
polyatomic ion
Turn to table E in your ref table
K2SO4 NH4Cl NH4NO3
Polyatomic ion are ternary (containing 3 or more elements)
-They are NOT neutral, they have a charge (either + or -)
- they are covalently bonded (made of nonmetals only)
SO42- NH4
1+ PO43- OH-
