5.2 The Modern Periodic Table

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Presentation transcript:

5.2 The Modern Periodic Table

The Periodic Law says: When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. Horizontal rows = periods There are 7 periods Vertical column = group (or family) Similar physical & chemical prop. Identified by number & letter

Areas of the periodic table Three classes of elements are: 1) metals, 2) nonmetals, and 3) metalloids/semi-metals Metals: electrical conductors, have luster, ductile, malleable Nonmetals: generally brittle and nonlustrous, poor conductors of heat and electricity

Areas of the periodic table Some nonmetals are gases (O, N, Cl); some are brittle solids (S); one is a fuming dark red liquid (Br) Notice the heavy, stair-step line? Metalloids: border the line Properties are intermediate between metals and nonmetals

Metals luster or shine solids at room temperature (except for Hg) malleable ( bent into thin sheets) ductile ( formed into wires)

Non-Metals no luster poor conductors of electricity and heat not malleable nor ductile gases at room temperature some are colored, some are colorless

Semi-Metals some properties of metals and some properties of non-metals