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Warm-up 1/29/08 Multiple these exponents

Warm-up 1/29/08 Multiple these exponents ( x 6 ) ( w 2 ) ( x 5 ) ( y 9 ) ( w 4 ) ( x 8 ) 2. Simplify. x -4 · y 3 · z 5 · x 5 · y -1 ÷ z 2. PS-2.3

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Warm-up 1/29/08 Multiple these exponents

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  1. Warm-up 1/29/08 • Multiple these exponents • ( x6) ( w2) ( x5) ( y9) ( w4) ( x8) • 2. Simplify. • x-4 · y3· z5 · x5 · y-1÷ z2

  2. PS-2.3 Explain the trends of the periodic table based on the elements’ valence electrons and atomic numbers.

  3. Period is the term used to describe a horizontal row on the periodic table. • Group and family are terms used to describe a vertical column on the periodic table.

  4. Metals • Metals have 3 or fewer valance electrons. • Metals lose electrons when making an ionic bond. • Metals are good conductors, malleable, and ductile.

  5. Warm-up 1/31/08 • Simplify: • w ·x2·z3·x-3·z ·w-1 • 2. Simplify: • ab2cd3 ·a2b3cd-1

  6. Metalloids • Metalloids have some characteristics of metals and some of nonmetals; they border the line between metals and nonmetals on the periodic table.

  7. Non-Metals

  8. On the EOC, students must: • Locate referenced elements when prompted with a period number or group number. • Determine a given element’s atomic number (number of protons). • Determine the number of electrons that an atom of a given element contains (the same as the number of protons-atomic number).

  9. Determine how many energy levels are occupied in a given element (recognize that the period in which an element appears on the periodic table indicates the number of occupied energy levels) • For example, all elements in period 4 have four occupied energy levels.

  10. Recognize a given element’s atomic mass (the weighted average of the masses of the naturally occurring isotopes of the element). • It is always larger than the atomic number and generally increases from left to right on the Periodic Table. • Determine the number of valence electrons (electrons in the outer-most energy level), for selected groups of elements when given the element’s group number or name.

  11. Periodic trends in the number of valence electrons: • From left to right across periods 1-3: • Atoms of all these elements contain one more valence electron than the atoms of the previous element. • From top to bottom within any group: • Atoms of all of the elements in a given group contain the same number of valence electrons.

  12. Pure Calcium

  13. Periodic trends in the number of energy levels: From left to right across any period: Atoms of all elements in a given period have the same number of energy levels. From top to bottom within any group: Atoms of each subsequent element (from top to bottom) in any given group contain one more energy level than the atoms of the element above.

  14. Homework p. 553 # 1-4 p. 562 # 1-4

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