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Introduction to Modern Periodic Table: Key Groups and Properties

Explore the development of the periodic table from Mendeleev to Moseley, highlighting the arrangement by atomic number, recurring properties, and distinctive groups like Alkali Metals and Noble Gases. Understand the properties of metals, gases, and liquids, and their classification within the table.

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Introduction to Modern Periodic Table: Key Groups and Properties

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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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