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Topic/ Objective: Periodic Table Name Date Essential Question: Explain the organization and trends of the periodic table. Period
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2. 5.1 Organizing Elements Last Chapter: Mendeleev’s Periodic Table
Column is called: Group
Row is called: Period
Periodic table: elements in columns with properties repeating row-row
Mendeleev’s Periodic Table
Proposal: arranged the elements into rows in order of increasing mass; similar properties in same column
Prediction
Not all elements discovered; spaces
Close match to new elements

3. 5.2 Modern Periodic Table
Periodic Law: pattern of repeating properties
Elements are arranged by increasing atomic number (# p+)
Row= period; increasing p+ across
Column = group; similar properties
Atomic Mass
amu: atomic mass units, use C-12 atoms are 1/12th mass C-12
Isotopes: different n numbers
Weighted avg: ex grading system; avg mass of isotopes
Classes of Elements
Metals, nonmetals, metalloids (between metals and nonmetals)

4. 5.3 Representative Groups
Valence e-: e- occupy the highest E level of atom
Alkali metals:1A, increase reactivity top to bottom
Alkali earth metals 2A: reactivity with water (temp)
142-Boron Family:3A, B metalloid, rest metals; Al most abundant in Earth’s crust
142-Carbon Family:4A, C 2nd abundant in body,
143-Nitrogen Family: 5A, N is common fertilizer
143-Oxygen Family: 6A, O most abundant in Earth’s crust
144-Halogens:7A, different phys appearances but similar chem properties (reactivity, flammability)
145-Noble gases: 8A, colorless/ odorless/ very unreactive