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A. Atomic Mass. 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 + + n 0. Mass #. Atomic #. B. Isotopes. Atoms of the same element with different mass numbers. Nuclear symbol:.

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a atomic mass
A. Atomic Mass
  • 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
b isotopes

Mass #

Atomic #

B. Isotopes
  • Atoms of the same element with different mass numbers.
  • Nuclear symbol:
  • Hyphen notation: carbon-12
b isotopes4
B. Isotopes
  • Chlorine-37
    • atomic #:
    • mass #:
    • # of protons:
    • # of electrons:
    • # of neutrons:

17

37

17

17

20

ch 3 the periodic table

Ch. 3 - The Periodic Table

Organization

Metallic Character

Rows & Columns

Table Sections

a metallic character
A. Metallic Character
  • Metals
  • Nonmetals
  • Metalloids
metals
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
alkali metals
Alkali Metals
  • Group 1
  • Very reactive
  • Form +1 ions
  • Cations
  • Examples: H, Li, Na
alkaline earth metals
Alkaline Earth Metals
  • Group 2
  • Reactive
  • Form 2+ ions
  • Cations
  • Examples: Be, Mg, Ca, etc
transition metals
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
nonmetals
Nonmetals
  • Not good conductors
  • Found on right side of periodic table – AND hydrogen
  • Usually brittle solids or gases
halogens
Halogens
  • Group 17
  • Very reactive
  • Form 1- ions
  • Anions
  • Examples: F, Cl, Br, etc
noble gases
Noble Gases
  • Group 18
  • Unreactive, inert, “noble”
  • Have a 0 charge, no ions
  • Examples: He, Ne, Ar, Kr, etc
metalloids
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
state at room temperature
State at Room Temperature
  • Most are solid
  • State changes with change in temperature
b table sections
B. Table Sections
  • Representative Elements
  • Transition Metals
  • Inner Transition Metals
b table sections18

Lanthanides - part of period 6

Actinides - part of period 7

B. Table Sections

Overall Configuration

c columns rows
C. Columns & Rows
  • Group (Family)
  • Period
ch 3 the periodic table20

Ch. 3 - The Periodic Table

Periodic Trends

Terms

Periodic Trends

Dot Diagrams

slide21

A. Terms

  • Periodic Law
  • Properties of elements repeat periodically when the elements are arranged by increasing atomic number.
a terms
A. Terms
  • Valence Electrons
    • e- in the outermost energy level
  • Atomic Radius
  • Measure of the size of an atom
b periodic trends

1A

8A

2A

3A 4A 5A 6A 7A

B. Periodic Trends
  • Group # = # of valence e- (except He)
    • Families have similar reactivity.
  • Period # = # of energy levels
c lewis diagrams
C. Lewis Diagrams
  • Dots represent the valence e-
  • EX: Sodium
  • EX: Chlorine
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