1. A. Atomic Mass Atomic mass = # p+ + n0
The average atomic mass is the number at the bottom of each square
Found by averaging the natural abundances of its isotopes
Atomic mass = # p+ + n0

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

3. B. Isotopes
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4. B. Isotopes Chlorine-37 atomic #: mass #: # of protons:
# of electrons:
# of neutrons: 17 37 20

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

6. A. Metallic Character
Metals
Nonmetals
Metalloids

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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