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Chapter 14. Chemical Periodicity. History of the Periodic Table. Mendeleev (1860’s) Developed the first periodic table It was arranged by atomic mass He was able to predict properties of elements. History of the Periodic Table (cont.). Moseley – developed the modern periodic table.
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Chapter 14 Chemical Periodicity
History of the Periodic Table • Mendeleev (1860’s) • Developed the first periodic table • It was arranged by atomic mass • He was able to predict properties of elements
History of the Periodic Table (cont.) • Moseley – developed the modern periodic table
Characteristics of Metals • Hard • Shiny • Conduct heat and electricity well • Includes the transition and inner-transition metals • Inner transition metals include the lanthanoids and actinoids
Characteristics of Nonmetals • Are gases or brittle solids at room temp. • Surfaces are dull • Insulators
Characteristics of Metalloids • Have properties of both metals and nonmetals
I. Periodic Table Revisited • Groups or Families (terms synonymous) • vertical columns • have similar chemical & physical properties • B. Periods • Horizontal rows • Energies of outermost electrons are similar
Period vs. Group • Period • All elements in a horizontal row • 7 periods on the periodic table
Group • All elements in a vertical column • Sometimes called “families”
II. Organization (your Roadmap) A. Metals- Nonmetals- Metalloids- Left of zig zag Right of zig zag On the zig zag NONMETALS METALLOIDS METALS
C. Group A & B Group A- Representative Group B - Transition TRANSITION “Group B” INNER TRANSITION REPRESENTATIVE “Group A”