Properties of Elements 3.3 + 3.4

add the fun facts for 3.4

Antoine Lavoisier

Scientifically defined chemical elements

• metals and nonmetals

John Dalton

Developed Dalton’s Atomic Theory

• Billiard Ball

Dobereiner

Observed similarities in physical and chemical properties

• grouped triads

Mendeleev

The Father of the Periodic Table

• grouped elements by properties and left gaps for undiscovered elements

  • predicted properties of elements that haven’t been discovered

JJ Thomson

Discovered electrons

• Plum Pudding model

Marie Curie

Discovered Polonium and Radium

Ramsay and Travers

dicovered neon, krypton, and xenon

Rutherford

An atomic model with the nucleus

Bohr

The atomic model with energy levels

Schrodinger

Atomic model with the electron cloud model

Technetium

Synthesized the first element

Glenn Seaborg

Developed the actinide concept, recognizing transuranium elements as their own group of elements

• Co-synthesized 10 elements

  • Element 106, Seaborgium, was named after him

Alkali Metals

• shiny, soft, and extremely reactive

• very low melting/boiling point

  • good at heat and electricity conducting

Alkaline-Earth Metals

• shiny

• softer than most metals

• fairly reactive

  • higher melting/boiling points than alkali metals

• good heat and electrical conductors

Transition Metals

• good conductors of heat/electricity

• malleable and ductile

• hard solids

• bright colors

• very high melting/boiling points

Post-Transition Metals

• malleable and ductile

  • have lower melting points than transition metals

  • poor conductors of heat and electricity

Metalloids

• Properties of metals and nonmetals

• brittle

  • can conduct electricity, but not as well as other metals

  • chemically like nonmetals

“Other” Nonmetals

• Poor conductors of heat and electricity

• Not malleable or ductile

  • Form brittle solids in compounds

    • Dull

Halogens

• Highly reactive and highly toxic

• Colorful

Noble Gases

• colorless, odorless, tasteless, nonflammable

• insert (nonreactive)

• extremely low melting points

Lanthanides

• Silvery-white with high melting points

• All have a stable isotope except for Promethium

Actinides

• Silver and radioactive

• Contain the most man-made elements in any group

• all of them are radioactive