Notes A.10-A.13 Organization of Periodic Table. Organization ● The periodic table is organized two ways, by period and by family ● Period = Going across.

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Presentation transcript:

Notes A.10-A.13 Organization of Periodic Table

Organization ● The periodic table is organized two ways, by period and by family ● Period = Going across in rows ● Family = up and down in a column

Family Period

Period & Family Organization ● Periods are organized according to atomic number ● Families are organized according to similar properties

Alkali family ● On far left of periodic table ● Reacts with chloride in 1:1 ratio and oxygen in 2:1 ratio ● Example: LiCl and Li 2 O

Noble Gas Family ● Located on far right of periodic table ● Consists of gases which are very unlikely to react with other elements

Halogen Family ● Located just to left of noble gases ● Contains chlorine, bromine, and fluorine ● Easily forms anions in ionic compounds

Predicting Properties ● We can predict physical and chemical properties using periodic table ● Use page 124 to do page 126 in book

Page 126 Answers 1. Between -186 and -112, around a. 320K b. Higher, melting point decrease with family from top to bottom 3. (EkaSi)Cl 4 4. a. CF 4 b. Al 2 S 3 c. KCl d. CaBr 2 e. SrO

How are properties determined? ● # protons determines identity and essential properties ● # and arrangement of electrons determines chemical properties ● Reactions between atoms determine some physical properties (mostly for metals) ● Intermolecular forces determine some physical and chemical properties of compounds