Lewis dot diagrams and BONDING!!! 8 th grade physical science
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1 Lewis dot diagrams and BONDING!!! 8 th grade physical science
2 1. A. A little review! An atom that gains one or more electrons will have a charge. An atom that loses one or more electrons will have a charge. B. NEW INFORMATION: NEGATIVE POSITIVE ION An atom that gains or loses one or more electrons is called an.
3 All atoms want to be happy, the key to their happiness is a full outer electron orbital, or valance shell. Elements will gain, lose or share electrons in order to reach the same number of electrons as the nearest noble gas this is known as the Octet Rule Some atoms have too few valence electrons to ever obtain an octet. Helium and hydrogen have too few valence electrons to ever obtain a full octet. Helium is the nearest noble gas to them, how many electrons will these elements try to achieve in their valance shell?
4 2. Lewis Dot Structures Gilbert Newton Lewis
5 Lewis Dot Structures For atoms Figure out how many valence electrons an atom has. 2. Draw the electrons as dots one at a Mme around the atoms symbol in a clockwise fashion starmng on the top. 3. AOer one electron is on each side, double them up unml you run out of electrons. 4. IE Erase the inside layers of a Bohr model and draw only the outermost shell use dots to represent the electrons! EXAMPLES 1. Na Cl Formula:. NoMce anything about these outer electrons????
6 3. What is an ionic bond? ELECTRONS Atoms will transfer one or more to another to form the bond. COMPLETE Each atom is leo with a outer shell and is now a charged parmcle. A posimve ion is called a CATION and a negamve ion is called an. ANION Cat-Eye-On An-Eye-On METAL An ionic bond forms between a ion with a posimve charge and a NONMETAL ion with a negamve charge.
7 They both have what the other needs.. Therefore they will form an ionic bond!!!
8 Atoms give or take electrons unml their outer most orbital is full! When they give or take electrons, then they gain a charge. Show the new Lewis dot diagram for the ion form
9 The ions bond together because they carry opposite charges and OPPOSITES ATTRACT!!!
10 Ionic Bond Practice Draw the Lewis Structures for the Potassium(K) ion and the Bromine (Br) ion Draw arrows showing how electrons are donated and accepted K Br Chemical Formula =
11 Ionic Bond Practice Draw the Lewis Structures for the lithium (Li) ion and the Oxygen (O) ion Li O Chemical Formula =
12 4. Ion Criss-Cross Li O Li 2 O
13 Ion Criss-Cross Practice Li + F Mg K B Cl O Cl
14 4a. When wrimng a chemical formula, subscripts show the number of atoms present of a certain element in molecule or compound H 2 O # of H= # of O= Li(OH) 2 # of Li= # of OH=
15 4b. A polyatomic ion is: a group of atoms that act like an ion To write the formulas if there is more than one of these groups one must use PARENTHESIS. Ex: Al and NO 3
16 5. Naming Ionic compounds Metal (+ ion) comes 1 st Non metals come 2 nd - names end in -ide. Example: sodium chloride Do not capitalized unless starting a sentence Give formula & name: Ca + I, O + Mg, Na + S = Ca 2+ I 1- = Mg 2+ O 2- = Na 1+ S 2-
17 = Ca 2 I 1 = CaI 2 = calcium iodide = Mg 2 O 2 = MgO = magnesium oxide = Na 1 S 2 = Na 2 S = sodium sulfide
18 5a. Rules for TransiMon Metals Many transimon metals have more than one oxidamon number. Indicate the parmcular oxidamon by using parenthesis Ex. Fe 2 O 3 vs. FeO iron (III) oxide vs. iron (II) oxide
19 5b. Compounds containing polyatomic ions Ba 3 (PO 4 ) 2 = barium phosphate Naming compounds with polyatomic ions is similar to naming other ionic compounds You should note that compounds with polyatomic ions have names ending in -ate or -ite not ide Name: Ca(OH) 2, CuSO 4, NH 4 NO 3, Co 2 (CO 3 ) 3
20 Compounds containing polyatomic ions Ca(OH) 2 CuSO 4 NH 4 NO 3 Co 2 (CO 3 ) 3 - calcium hydroxide - copper(ii) sulfate - ammonium nitrate - cobalt(iii) carbonate
21 Write the formula for and name the following compounds: Hydrogen & Chlorine Calcium & Bromine Beryllium & Fluorine
22 Write the formula for the following compounds: calcium carbonate sodium hydroxide sodium sulfite
23 6. What is a covalent bond? SHARE Atoms one or more electrons with each other to form the bond. COMPLETE Each atom is leo with a outer shell. NONMETALS A covalent bond forms between two.
24
25
26
27
28 Try this: H O H
29 H H a. Atoms share valence electrons O H O H
30
31 Use Lewis dot diagrams to draw the following covalent bonds: Example1: Chlorine + Chlorine Example2: Oxygen + Oxygen Example3: Carbon + 2 Oxygen Example4: Carbon + 4 Hydrogen
32 F F
33 O O
34 N N
35 7. Bond CharacterisGcs: Ionic compounds VS Covalent compounds 1. Hard 2. Bridle 3. High MelMng Point 4. Only conduct electricity when melted or dissolved 5. Found as solids at room temperature 1. Solid, Liquid or gas 2. Low melmng point / boiling point 3. Flammable 4. Do not conduct electricity 5. Do not dissolve in water
36
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