13 1 Electrons and Chemical Bonds Valence Electrons

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13. 1 Electrons and Chemical Bonds

13. 1 Electrons and Chemical Bonds

Valence Electrons Valence electrons: electrons in the outermost (highest) energy level

Valence Electrons Valence electrons: electrons in the outermost (highest) energy level

Valence Electrons – a trick 1 2 3 Look at Group Numbers! 4 5

Valence Electrons – a trick 1 2 3 Look at Group Numbers! 4 5 7 6 8

How many Valence Electrons? Nitrogen (N) n Carbon (C) n Potassium (K) n

How many Valence Electrons? Nitrogen (N) n Carbon (C) n Potassium (K) n

Lewis Dot Diagrams A Lewis dot diagram shows the element symbol surrounded by dots

Lewis Dot Diagrams A Lewis dot diagram shows the element symbol surrounded by dots representing the valence electrons. Example: To draw a Lewis dot diagram: 1. Determine the number of valence electrons 2. Write the symbol and add dots for valence electrons

Valence Electrons Practice Now draw the Lewis dot diagrams: Element Name Symbol Number of

Valence Electrons Practice Now draw the Lewis dot diagrams: Element Name Symbol Number of Electrons Number of Valence Electrons Nitrogen N 7 5 Oxygen O 8 6 Fluorine F 9 7 Neon Ne 10 8 Lewis Dot Diagram

Lewis Dot Diagrams on PT n Group # = # valence electrons Transition metals

Lewis Dot Diagrams on PT n Group # = # valence electrons Transition metals are weird, ignore for now!

Chemical Bonds Chemical bonds are formed only between the electrons in the highest unfilled

Chemical Bonds Chemical bonds are formed only between the electrons in the highest unfilled energy level.

Types of Chemical Bonds A chemical bond forms when atoms transfer or share electrons.

Types of Chemical Bonds A chemical bond forms when atoms transfer or share electrons. Covalent Bonds – atoms share valence electrons Ionic Bonds – atoms transfer valence electrons

Dogs Teaching Chemistry! https: //www. youtube. com/watch? v=_M 9 khs 87 x. Q 8

Dogs Teaching Chemistry! https: //www. youtube. com/watch? v=_M 9 khs 87 x. Q 8

Covalent Bonds • Form between nonmetals • Share electrons

Covalent Bonds • Form between nonmetals • Share electrons

Ionic Bonds • Form between metal and nonmetal • Electron(s) transferred from metal to

Ionic Bonds • Form between metal and nonmetal • Electron(s) transferred from metal to nonmetal • Ions are formed • Bond = attraction Sodium loses an electron and becomes a positively charged ion Chlorine gains an electron and becomes a negatively charged ion

Chemical formulas A chemical formula tells the ratio of atoms of each element in

Chemical formulas A chemical formula tells the ratio of atoms of each element in the compound.

Lewis Dot Diagrams EXIT SLIP Answer the following questions about phosphorous: 1. 2. 3.

Lewis Dot Diagrams EXIT SLIP Answer the following questions about phosphorous: 1. 2. 3. How many total electrons does phosphorous have? How many valence electrons does phosphorous have? What is the Lewis dot diagram for phosphorous?

Groups… n n n n n Jean, Kalie, Chris – Lab station 1 Brianna,

Groups… n n n n n Jean, Kalie, Chris – Lab station 1 Brianna, Jazz, Anna – Lab station 3 Jackie, Mandy, Randy – Lab station 5 Cole C, Tara, Dylan – Lab station 7 David, Sam, Maddie – Lab station 9 Devon, Amanda, Ayrias – Lab station 11 Cole F, Eli, Lysandra – Lab station 13 Juan, Andre, Gilberto – Desks Liz, Herlinda, Zach – Desks Mohamed, Tas, Avery – Desks