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A. Atomic Mass The average atomic mass is the number at the bottom of each square The average atomic mass is the number at the bottom of each square Found.

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Presentation on theme: "A. Atomic Mass The average atomic mass is the number at the bottom of each square The average atomic mass is the number at the bottom of each square Found."— Presentation transcript:

1 A. Atomic Mass The average atomic mass is the number at the bottom of each square The average atomic mass is the number at the bottom of each square Found by averaging the natural abundances of its isotopes Found by averaging the natural abundances of its isotopes Atomic mass = # p + + n 0 Atomic mass = # p + + n 0

2 B. Isotopes Atoms of the same element with different mass numbers. Atoms of the same element with different mass numbers. Mass # Atomic # Nuclear symbol: Nuclear symbol: Hyphen notation: carbon-12 Hyphen notation: carbon-12

3 B. Isotopes © Addison-Wesley Publishing Company, Inc.

4 B. Isotopes Chlorine-37 Chlorine-37 –atomic #: –mass #: –# of protons: –# of electrons: –# of neutrons:

5 Ch. 3 - The Periodic Table Organization Metallic Character Metallic Character Rows & Columns Rows & Columns Table Sections Table Sections

6 A. Metallic Character Metals Metals Nonmetals Nonmetals Metalloids Metalloids

7 Metals Good conductors of heat and electricity Good conductors of heat and electricity Found in Groups 1 & 2, middle of table in 3-12 and some on right side of table Found in Groups 1 & 2, middle of table in 3-12 and some on right side of table Have luster, are ductile and malleable Have luster, are ductile and malleable

8 Alkali Metals Group 1 Group 1 Very reactive Very reactive Form +1 ions Form +1 ions Cations Cations Examples: H, Li, Na Examples: H, Li, Na

9 Alkaline Earth Metals Group 2 Group 2 Reactive Reactive Form 2+ ions Form 2+ ions Cations Cations Examples: Be, Mg, Ca, etc Examples: Be, Mg, Ca, etc

10 Transition Metals Groups 3-12 on the Periodic Table Groups 3-12 on the Periodic Table Much less reactive than Alkali or Alkaline Earth Metals Much less reactive than Alkali or Alkaline Earth Metals Only 1 that is a liquid at room temp Only 1 that is a liquid at room temp –Mercury – Hg Examples: Cr, Co, Ni, Fe, Cu, Ag, Au Examples: Cr, Co, Ni, Fe, Cu, Ag, Au

11 Nonmetals Not good conductors Not good conductors Found on right side of periodic table – AND hydrogen Found on right side of periodic table – AND hydrogen Usually brittle solids or gases Usually brittle solids or gases

12 Halogens Group 17 Group 17 Very reactive Very reactive Form 1- ions Form 1- ions Anions Anions Examples: F, Cl, Br, etc Examples: F, Cl, Br, etc

13 Noble Gases Group 18 Group 18 Unreactive, inert, noble Unreactive, inert, noble Have a 0 charge, no ions Have a 0 charge, no ions Examples: He, Ne, Ar, Kr, etc Examples: He, Ne, Ar, Kr, etc

14 Metalloids Sometimes called semiconductors Sometimes called semiconductors Form the stairstep between metals and nonmetals Form the stairstep between metals and nonmetals Have properties of both metals and nonmetals Have properties of both metals and nonmetals Examples: B, Si, Sb, Te, As, Ge Examples: B, Si, Sb, Te, As, Ge

15 State at Room Temperature Most are solid Most are solid State changes with change in temperature State changes with change in temperature

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17 B. Table Sections Representative Elements Representative Elements Transition Metals Transition Metals Inner Transition Metals Inner Transition Metals

18 B. Table Sections Lanthanides - part of period 6 Actinides - part of period 7 Overall Configuration

19 C. Columns & Rows Group (Family) Group (Family) Period Period

20 Ch. 3 - The Periodic Table Periodic Trends Terms Terms Periodic Trends Periodic Trends Dot Diagrams Dot Diagrams

21 Periodic Law Periodic Law –Properties of elements repeat periodically when the elements are arranged by increasing atomic number. A. Terms

22 Valence Electrons Valence Electrons –e - in the outermost energy level Atomic Radius Atomic Radius –Measure of the size of an atom

23 B. Periodic Trends Group # = # of valence e - (except He) Group # = # of valence e - (except He) –Families have similar reactivity. Period # = # of energy levels Period # = # of energy levels 1A 2A 3A 4A 5A 6A 7A 8A

24 C. Lewis Diagrams Dots represent the valence e - Dots represent the valence e - EX: Sodium EX: Sodium EX: Chlorine EX: Chlorine


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