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Chapter 5 Section 4

Chapter 5 Section 4. Modern Periodic Table -grew from the work of Dmitri Mendeleev -arranged elements according to increasing atomic mass Today -arranged in order of increasing atomic number -Henry Moseley did this in 1913

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Chapter 5 Section 4

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  1. Chapter 5 Section 4 Modern Periodic Table -grew from the work of Dmitri Mendeleev -arranged elements according to increasing atomic mass Today -arranged in order of increasing atomic number -Henry Moseley did this in 1913 -called periodic law- when elements are arranged in order of increasing mass/atomic #, similar properties will recur

  2. periods- horizontal rows groups/families- vertical columns, identified by a # and a letter Groups of the Periodic Table Alkali Metals- Group 1A elements Alkaline Earth Metals- Group 2A elements Transition Metals- Group B elements, bridge Inner Transition Metals- two rows at the bottom non-metals- upper and lower right side

  3. Metalloids- staircase- starting at boron Halogens- Group 7A Noble Gases- Group 8A or Group 0 -also called inert gases- they do not react to form compounds Main group or Representative elements -Groups 1A to 7A minus the Transition metals

  4. Properties of Metals • conduct electricity • ductile (can be drawn into wires) • shiny/lustrous • malleable (can be pounded into sheets) -Most elements are solids Gases = H, O, N, F, Cℓ, He Ne, Ar, Kr, Xe, Rn Liquids = Hg, Br (Ga, Fr, Cs)

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