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Topic: The Periodic Table Aim: How is the Periodic Table arranged?

Topic: The Periodic Table Aim: How is the Periodic Table arranged?. Do Now: What is the mass number of an atom that contains 21 electrons, 21 protons and 24 neutrons? a. 21 b. 42 c. 45 d. 66. HW:. In this chapter, you will use…. The Periodic Table Table S But first, you must know…

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Topic: The Periodic Table Aim: How is the Periodic Table arranged?

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  1. Topic: The Periodic TableAim: How is the Periodic Table arranged? Do Now: What is the mass number of an atom that contains 21 electrons, 21 protons and 24 neutrons?a. 21 b. 42 c. 45 d. 66 HW:

  2. In this chapter, you will use… • The Periodic Table • Table S • But first, you must know… • THE SONG! • or… THE SONG! • or… THE SONG!

  3. Development • Henry Mosely • Dmitri Mendeleev • Noticed repeating trends in the known elements of the time • Table includes all natural & synthetic elements • LOCATION of an element tells you a LOT about its phys & chem properties • Mendeleev Dmitri Mendeleev

  4. Mendeleev’s Periodic Table

  5. Periodic Law • Table is arranged in order of INCREASING ATOMIC NUMBER… NOT MASS! • Periodic Law – properties of elements are a function of atomic number (**patterns repeat themselves when the table is arranged this way**)

  6. Sections of the Table • Elements LEFT of the bold zigzag line: • METALS (except H) • Elements RIGHT of bold zigzag line: • NONMETALS • Elements TOUCHING the zigzag line: • METALLOIDS (there are 7)

  7. Properties of Metals • Solid @ room temp. – exception? • Hg (mercury) • Malleable – can be molded • Ductile – can be drawn into a wire • Luster – shiny Copper wire

  8. Metals, cont. • Good conductors of heat & electricity • Chuck Norris destroyed the Periodic Table, because he only recognizes the element of surprise. • Density >1 (See Table S)

  9. Metals, cont. • Low ionization energy • IONIZATION ENERGY – amount of energy it takes to remove a valence e- • easy to remove an e- from a metal b/c they only have 1 or 2 valence e- • Remember – elements want 8 valence e- (octet rule) • If they only have 1, 2, or 3 valence e-, they aren’t close to completing their valence PEL, so they’re more likely to give them up! • See Table S

  10. Metals, cont. • Low electronegativity • ELECTRONEGATIVITY – tendency for an element to attract an e- • Again, b/c they have few valence e- and would need so many more to fill their valence PEL • See Table S

  11. Properties of Nonmetals • S, L, or G @ room temp. • Not malleable • Not ductile • Brittle • Dull Phosphorus

  12. Nonmetals, cont. • Poor conductors of heat & electricity • High ionization energy – difficult to remove an e- b/c the valence PEL is almost full! • High electronegativity – they ♥ e- • Low density

  13. Properties of Metalloids • Some properties of metals & nonmetals • Touching zig-zag line

  14. Sample Questions

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