Mid-Term Review Day #3—Valence Electrons and Mixed Review! Do Now: HW, Reference Tables, and...
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Transcript of Mid-Term Review Day #3—Valence Electrons and Mixed Review! Do Now: HW, Reference Tables, and...
![Page 1: Mid-Term Review Day #3—Valence Electrons and Mixed Review! Do Now: HW, Reference Tables, and Calculator Out. Complete Do Now on handout.](https://reader030.fdocuments.in/reader030/viewer/2022032709/56649e9f5503460f94ba157b/html5/thumbnails/1.jpg)
Mid-Term ReviewDay #3—Valence Electrons and Mixed Review!
Do Now: HW, Reference Tables, and Calculator Out.
Complete Do Now on handout
![Page 2: Mid-Term Review Day #3—Valence Electrons and Mixed Review! Do Now: HW, Reference Tables, and Calculator Out. Complete Do Now on handout.](https://reader030.fdocuments.in/reader030/viewer/2022032709/56649e9f5503460f94ba157b/html5/thumbnails/2.jpg)
![Page 3: Mid-Term Review Day #3—Valence Electrons and Mixed Review! Do Now: HW, Reference Tables, and Calculator Out. Complete Do Now on handout.](https://reader030.fdocuments.in/reader030/viewer/2022032709/56649e9f5503460f94ba157b/html5/thumbnails/3.jpg)
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Valence Electrons are the electrons found in the outermost shell of an atom. Lewis
structures depict valence electrons as dots surrounding the element symbol.
• Sample question:• Draw the Lewis electron dot diagram for
Fluorine pictured here.
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Valence Electrons are found as the last number in the electron configuration found on the
periodic table.
• Sample question:• How many valence electrons do the
atoms in Group 16 have?
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Atoms become stable and unreactive with 8 valence electrons (or 2 for H, He and Li). Noble gases (group 18) all have 8
valence electrons. Every other atom gains, loses or shares electrons to reach 8 valence electrons.
• Sample question: When nitrogen shares electrons to reach 8 valence electrons, which noble gas will it share an electron configuration with?
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Ionic bonds form when metals transfer their valence electrons to non-metals. This allows
both atoms to have 8 valence electrons.
• Sample question: Explain, in terms of electrons, the type of bonding between Ca and Cl in CaCl2. [1]
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Covalent bonds form when non-metals share valence electrons. This allows all bonding
atoms to have 8 valence electrons.
• Sample question: Explain, in terms of electrons, the type of bonding between C and O in CO2. [1]
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1) 2 2) 2 3) 2 4) 4 8) 4 9) 2 10) +511) ethane
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5) 3 6) 2 7) 2 12) D 13) 4
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• They were deflected because the nucleus was positive and alpha particles were positive. Like charges repel!
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• H = 2 mol x 1.0 g = 2 g• O = 2 mol x 16.0 g = 32 g• 32 + 2 = 34 g/mol
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16) Si = ground 2-8-4 excited 2-7-5 or 2-8-3-117) Mass = protons + neutrons Al = 13 + X = 27 amu = 14 neutrons18) 2KClO3 2KCl + 3O2
19) decomposition
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Bonding HW
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Summary
• Explain how valence electrons are related to bonding?